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/**

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* Sanitizes content for allowed HTML tags for the specified context.

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* @param string $input Content to filter.

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* @param string $context Context used to decide allowed tags and attributes.

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* @return string Filtered text with allowed HTML tags and attributes intact.

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function wpcf7_kses( $input, $context = 'form' ) {

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$output = wp_kses(

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$input,

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wpcf7_kses_allowed_html( $context )

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);

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return $output;

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}

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/**

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* Returns a formatted string of HTML attributes.

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* @param array $atts Associative array of attribute name and value pairs.

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* @return string Formatted HTML attributes.

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function wpcf7_format_atts( $atts ) {

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$atts_filtered = array();

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foreach ( $atts as $name => $value ) {

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$name = strtolower( trim( $name ) );

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if ( ! preg_match( '/^[a-z_:][a-z_:.0-9-]*$/', $name ) ) {

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continue;

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}

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static $boolean_attributes = array(

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'checked',

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'disabled',

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'inert',

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'multiple',

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'readonly',

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'required',

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'selected',

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);

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if ( in_array( $name, $boolean_attributes ) and '' === $value ) {

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$value = false;

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}

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if ( is_numeric( $value ) ) {

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$value = (string) $value;

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}

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if ( null === $value or false === $value ) {

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unset( $atts_filtered[$name] );

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} elseif ( true === $value ) {

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$atts_filtered[$name] = $name; // boolean attribute

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} elseif ( is_string( $value ) ) {

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$atts_filtered[$name] = trim( $value );

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}

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}

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$output = '';

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foreach ( $atts_filtered as $name => $value ) {

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$output .= sprintf( ' %1$s="%2$s"', $name, esc_attr( $value ) );

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}

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return trim( $output );

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}

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