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* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/

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* Conditional Tags} article in the Theme Developer Handbook.

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* @since 0.71

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* @global string $currentday The day of the current post in the loop.

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* @global string $previousday The day of the previous post in the loop.

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* @return int 1 when new day, 0 if not a new day.

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function is_new_day() {

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global $currentday, $previousday;

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if ( $currentday !== $previousday ) {

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return 1;

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} else {

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return 0;

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}

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}

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/**

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* Builds URL query based on an associative and, or indexed array.

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* This is a convenient function for easily building url queries. It sets the

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* separator to '&' and uses _http_build_query() function.

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* @since 2.3.0

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* @see _http_build_query() Used to build the query

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* @link https://www.php.net/manual/en/function.http-build-query.php for more on what

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* http_build_query() does.

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* @param array $data URL-encode key/value pairs.

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* @return string URL-encoded string.

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function build_query( $data ) {

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return _http_build_query( $data, null, '&', '', false );

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}

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/**

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* From php.net (modified by Mark Jaquith to behave like the native PHP5 function).

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* @since 3.2.0

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* @access private

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* @see https://www.php.net/manual/en/function.http-build-query.php

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* @param array|object $data An array or object of data. Converted to array.

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* @param string $prefix Optional. Numeric index. If set, start parameter numbering with it.

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* Default null.

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* @param string $sep Optional. Argument separator; defaults to 'arg_separator.output'.

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* Default null.

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* @param string $key Optional. Used to prefix key name. Default empty string.

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* @param bool $urlencode Optional. Whether to use urlencode() in the result. Default true.

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* @return string The query string.

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function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urlencode = true ) {

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$ret = array();

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foreach ( (array) $data as $k => $v ) {

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if ( $urlencode ) {

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$k = urlencode( $k );

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}

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if ( is_int( $k ) && null !== $prefix ) {

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$k = $prefix . $k;

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}

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if ( ! empty( $key ) ) {

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$k = $key . '%5B' . $k . '%5D';

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}

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if ( null === $v ) {

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continue;

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} elseif ( false === $v ) {

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$v = '0';

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}

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if ( is_array( $v ) || is_object( $v ) ) {

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array_push( $ret, _http_build_query( $v, '', $sep, $k, $urlencode ) );

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} elseif ( $urlencode ) {

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array_push( $ret, $k . '=' . urlencode( $v ) );

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} else {

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array_push( $ret, $k . '=' . $v );

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}

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}

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if ( null === $sep ) {

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$sep = ini_get( 'arg_separator.output' );

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}

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return implode( $sep, $ret );

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}

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/**

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* Retrieves a modified URL query string.

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* You can rebuild the URL and append query variables to the URL query by using this function.

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* There are two ways to use this function; either a single key and value, or an associative array.

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* Using a single key and value:

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* add_query_arg( 'key', 'value', 'http://example.com' );

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* Using an associative array:

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* add_query_arg( array(

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* 'key1' => 'value1',

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* 'key2' => 'value2',

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* ), 'http://example.com' );

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* Omitting the URL from either use results in the current URL being used

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* (the value of `$_SERVER['REQUEST_URI']`).

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* Values are expected to be encoded appropriately with urlencode() or rawurlencode().

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* Setting any query variable's value to boolean false removes the key (see remove_query_arg()).

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* Important: The return value of add_query_arg() is not escaped by default. Output should be

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* late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting

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* (XSS) attacks.

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* @since 1.5.0

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* @since 5.3.0 Formalized the existing and already documented parameters

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* by adding `...$args` to the function signature.

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* @param string|array $key Either a query variable key, or an associative array of query variables.

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* @param string $value Optional. Either a query variable value, or a URL to act upon.

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* @param string $url Optional. A URL to act upon.

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* @return string New URL query string (unescaped).

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function add_query_arg( ...$args ) {

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if ( is_array( $args[0] ) ) {

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if ( count( $args ) < 2 || false === $args[1] ) {

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$uri = $_SERVER['REQUEST_URI'];

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} else {

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$uri = $args[1];

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}

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} else {

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if ( count( $args ) < 3 || false === $args[2] ) {

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$uri = $_SERVER['REQUEST_URI'];

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} else {

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$uri = $args[2];

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}

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}

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$frag = strstr( $uri, '#' );

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if ( $frag ) {

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$uri = substr( $uri, 0, -strlen( $frag ) );

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} else {

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$frag = '';

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}

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if ( 0 === stripos( $uri, 'http://' ) ) {

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$protocol = 'http://';

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$uri = substr( $uri, 7 );

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} elseif ( 0 === stripos( $uri, 'https://' ) ) {

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$protocol = 'https://';

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$uri = substr( $uri, 8 );

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} else {

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$protocol = '';

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}

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if ( str_contains( $uri, '?' ) ) {

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list( $base, $query ) = explode( '?', $uri, 2 );

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$base .= '?';

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} elseif ( $protocol || ! str_contains( $uri, '=' ) ) {

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$base = $uri . '?';

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$query = '';

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} else {

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$base = '';

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$query = $uri;

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}

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wp_parse_str( $query, $qs );

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$qs = urlencode_deep( $qs ); // This re-URL-encodes things that were already in the query string.

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if ( is_array( $args[0] ) ) {

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foreach ( $args[0] as $k => $v ) {

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$qs[ $k ] = $v;

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}

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} else {

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$qs[ $args[0] ] = $args[1];

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}

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foreach ( $qs as $k => $v ) {

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if ( false === $v ) {

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unset( $qs[ $k ] );

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}

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}

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$ret = build_query( $qs );

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$ret = trim( $ret, '?' );

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$ret = preg_replace( '#=(&|$)#', '$1', $ret );

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$ret = $protocol . $base . $ret . $frag;

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$ret = rtrim( $ret, '?' );

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$ret = str_replace( '?#', '#', $ret );

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return $ret;

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}

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/**

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* Removes an item or items from a query string.

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* Important: The return value of remove_query_arg() is not escaped by default. Output should be

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* late-escaped with esc_url() or similar to help prevent vulnerability to cross-site scripting

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* (XSS) attacks.

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* @since 1.5.0

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* @param string|string[] $key Query key or keys to remove.

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* @param false|string $query Optional. When false uses the current URL. Default false.

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* @return string New URL query string.

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function remove_query_arg( $key, $query = false ) {

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if ( is_array( $key ) ) { // Removing multiple keys.

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foreach ( $key as $k ) {

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$query = add_query_arg( $k, false, $query );

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}

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return $query;

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}

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return add_query_arg( $key, false, $query );

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}

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/**

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* Returns an array of single-use query variable names that can be removed from a URL.

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* @since 4.4.0

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* @return string[] An array of query variable names to remove from the URL.

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function wp_removable_query_args() {

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$removable_query_args = array(

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'activate',

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'activated',

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'admin_email_remind_later',

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'approved',

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'core-major-auto-updates-saved',

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'deactivate',

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'delete_count',

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'deleted',

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'disabled',

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'doing_wp_cron',

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'enabled',

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'error',

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'hotkeys_highlight_first',

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'hotkeys_highlight_last',

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'ids',

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'locked',

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'message',

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'same',

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'saved',

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'settings-updated',

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'skipped',

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'spammed',

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'trashed',

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'unspammed',

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'untrashed',

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'update',

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'updated',

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'wp-post-new-reload',

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);

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/**

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* Filters the list of query variable names to remove.

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* @since 4.2.0

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* @param string[] $removable_query_args An array of query variable names to remove from a URL.

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return apply_filters( 'removable_query_args', $removable_query_args );

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}

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/**

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* Walks the array while sanitizing the contents.

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* @since 0.71

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* @since 5.5.0 Non-string values are left untouched.

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* @param array $input_array Array to walk while sanitizing contents.

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* @return array Sanitized $input_array.

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function add_magic_quotes( $input_array ) {

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foreach ( (array) $input_array as $k => $v ) {

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if ( is_array( $v ) ) {

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$input_array[ $k ] = add_magic_quotes( $v );

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} elseif ( is_string( $v ) ) {

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$input_array[ $k ] = addslashes( $v );

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}

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}

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return $input_array;

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}

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/**

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* HTTP request for URI to retrieve content.

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* @since 1.5.1

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* @see wp_safe_remote_get()

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* @param string $uri URI/URL of web page to retrieve.

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* @return string|false HTTP content. False on failure.

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function wp_remote_fopen( $uri ) {

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$parsed_url = parse_url( $uri );

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if ( ! $parsed_url || ! is_array( $parsed_url ) ) {

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return false;

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}

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$options = array();

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$options['timeout'] = 10;

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$response = wp_safe_remote_get( $uri, $options );

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if ( is_wp_error( $response ) ) {

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return false;

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}

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return wp_remote_retrieve_body( $response );

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}

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/**

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* Sets up the WordPress query.

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* @since 2.0.0

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* @global WP $wp Current WordPress environment instance.

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* @global WP_Query $wp_query WordPress Query object.

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* @global WP_Query $wp_the_query Copy of the WordPress Query object.

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* @param string|array $query_vars Default WP_Query arguments.

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function wp( $query_vars = '' ) {

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global $wp, $wp_query, $wp_the_query;

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$wp->main( $query_vars );

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if ( ! isset( $wp_the_query ) ) {

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$wp_the_query = $wp_query;

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}

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}

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/**

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* Retrieves the description for the HTTP status.

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* @since 2.3.0

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* @since 3.9.0 Added status codes 418, 428, 429, 431, and 511.

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* @since 4.5.0 Added status codes 308, 421, and 451.

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* @since 5.1.0 Added status code 103.

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* @since 6.6.0 Added status code 425.

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* @global array $wp_header_to_desc

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* @param int $code HTTP status code.

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* @return string Status description if found, an empty string otherwise.

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function get_status_header_desc( $code ) {

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global $wp_header_to_desc;

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$code = absint( $code );

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if ( ! isset( $wp_header_to_desc ) ) {

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$wp_header_to_desc = array(

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100 => 'Continue',

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101 => 'Switching Protocols',

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102 => 'Processing',

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103 => 'Early Hints',

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200 => 'OK',

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201 => 'Created',

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202 => 'Accepted',

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203 => 'Non-Authoritative Information',

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204 => 'No Content',

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205 => 'Reset Content',

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206 => 'Partial Content',

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207 => 'Multi-Status',

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226 => 'IM Used',

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300 => 'Multiple Choices',

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301 => 'Moved Permanently',

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302 => 'Found',

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303 => 'See Other',

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304 => 'Not Modified',

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305 => 'Use Proxy',

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306 => 'Reserved',

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307 => 'Temporary Redirect',

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308 => 'Permanent Redirect',

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400 => 'Bad Request',

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401 => 'Unauthorized',

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402 => 'Payment Required',

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403 => 'Forbidden',

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404 => 'Not Found',

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405 => 'Method Not Allowed',

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406 => 'Not Acceptable',

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407 => 'Proxy Authentication Required',

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408 => 'Request Timeout',

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409 => 'Conflict',

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410 => 'Gone',

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411 => 'Length Required',

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412 => 'Precondition Failed',

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413 => 'Request Entity Too Large',

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414 => 'Request-URI Too Long',

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415 => 'Unsupported Media Type',

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416 => 'Requested Range Not Satisfiable',

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417 => 'Expectation Failed',

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418 => 'I\'m a teapot',

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421 => 'Misdirected Request',

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422 => 'Unprocessable Entity',

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423 => 'Locked',

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424 => 'Failed Dependency',

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425 => 'Too Early',

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426 => 'Upgrade Required',

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428 => 'Precondition Required',

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429 => 'Too Many Requests',

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431 => 'Request Header Fields Too Large',

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451 => 'Unavailable For Legal Reasons',

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500 => 'Internal Server Error',

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501 => 'Not Implemented',

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502 => 'Bad Gateway',

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503 => 'Service Unavailable',

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504 => 'Gateway Timeout',

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505 => 'HTTP Version Not Supported',

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506 => 'Variant Also Negotiates',

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507 => 'Insufficient Storage',

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510 => 'Not Extended',

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511 => 'Network Authentication Required',

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);

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}

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if ( isset( $wp_header_to_desc[ $code ] ) ) {

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return $wp_header_to_desc[ $code ];

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} else {

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return '';

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}

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}

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/**

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* Sets HTTP status header.

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[1440] Fix | Delete

* @since 2.0.0

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* @since 4.4.0 Added the `$description` parameter.

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* @see get_status_header_desc()

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* @param int $code HTTP status code.

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* @param string $description Optional. A custom description for the HTTP status.

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* Defaults to the result of get_status_header_desc() for the given code.

[1448] Fix | Delete

[1449] Fix | Delete

function status_header( $code, $description = '' ) {

[1450] Fix | Delete

if ( ! $description ) {

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$description = get_status_header_desc( $code );

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}

[1453] Fix | Delete

[1454] Fix | Delete

if ( empty( $description ) ) {

[1455] Fix | Delete

return;

[1456] Fix | Delete

}

[1457] Fix | Delete

[1458] Fix | Delete

$protocol = wp_get_server_protocol();

[1459] Fix | Delete

$status_header = "$protocol $code $description";

[1460] Fix | Delete

if ( function_exists( 'apply_filters' ) ) {

[1461] Fix | Delete

[1462] Fix | Delete

/**

[1463] Fix | Delete

* Filters an HTTP status header.

[1464] Fix | Delete

[1465] Fix | Delete

* @since 2.2.0

[1466] Fix | Delete

[1467] Fix | Delete

* @param string $status_header HTTP status header.

[1468] Fix | Delete

* @param int $code HTTP status code.

[1469] Fix | Delete

* @param string $description Description for the status code.

[1470] Fix | Delete

* @param string $protocol Server protocol.

[1471] Fix | Delete

[1472] Fix | Delete

$status_header = apply_filters( 'status_header', $status_header, $code, $description, $protocol );

[1473] Fix | Delete

}

[1474] Fix | Delete

[1475] Fix | Delete

if ( ! headers_sent() ) {

[1476] Fix | Delete

header( $status_header, true, $code );

[1477] Fix | Delete

}

[1478] Fix | Delete

}

[1479] Fix | Delete

[1480] Fix | Delete

/**

[1481] Fix | Delete

* Gets the HTTP header information to prevent caching.

[1482] Fix | Delete

[1483] Fix | Delete

* The several different headers cover the different ways cache prevention

[1484] Fix | Delete

* is handled by different browsers.

[1485] Fix | Delete

[1486] Fix | Delete

* @since 2.8.0

[1487] Fix | Delete

* @since 6.3.0 The `Cache-Control` header for logged in users now includes the

[1488] Fix | Delete

* `no-store` and `private` directives.

[1489] Fix | Delete

[1490] Fix | Delete

* @return array The associative array of header names and field values.

[1491] Fix | Delete

[1492] Fix | Delete

function wp_get_nocache_headers() {

[1493] Fix | Delete

$cache_control = ( function_exists( 'is_user_logged_in' ) && is_user_logged_in() )

[1494] Fix | Delete

? 'no-cache, must-revalidate, max-age=0, no-store, private'

[1495] Fix | Delete

: 'no-cache, must-revalidate, max-age=0';

[1496] Fix | Delete

[1497] Fix | Delete

$headers = array(

[1498] Fix | Delete

'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',

[1499] Fix | Delete

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