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<?php

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/**

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* @param string $input

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* @param string $default_if_invalid

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* @return string

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function wpml_sanitize_hex_color( $input, $default_if_invalid = '' ) {

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$input = sanitize_text_field( $input );

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$result = $input;

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if ( ! is_string( $input ) || ! wpml_is_valid_hex_color( $input ) ) {

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$result = $default_if_invalid;

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}

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return $result;

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}

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function wpml_sanitize_hex_color_array( $input, $default_if_invalid = '', $bypass_non_strings = true, $recursive = false ) {

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$result = $input;

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if ( is_array( $input ) ) {

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$result = array();

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foreach ( $input as $key => $value ) {

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if ( is_array( $value ) && $recursive ) {

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$result[ $key ] = wpml_sanitize_hex_color_array( $value, $default_if_invalid, $recursive );

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} elseif ( is_string( $value ) ) {

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$result[ $key ] = wpml_sanitize_hex_color( $value, $default_if_invalid );

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} elseif ( $bypass_non_strings ) {

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$result[ $key ] = $value;

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}

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}

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}

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return $result;

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}

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/**

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* @param string $input

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* @return bool

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function wpml_is_valid_hex_color( $input ) {

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if ( 'transparent' === $input || preg_match( '/' . wpml_get_valid_hex_color_pattern() . '/i', $input ) ) {

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$is_valid = true;

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} else {

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$try_rgb2hex = wpml_rgb_to_hex( $input );

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$is_valid = $try_rgb2hex ? preg_match( '/' . wpml_get_valid_hex_color_pattern() . '/i', $try_rgb2hex ) : false;

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}

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return $is_valid;

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}

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function wpml_get_valid_hex_color_pattern() {

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return '(^#[a-fA-F0-9]{6}$)|(^#[a-fA-F0-9]{3}$)';

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}

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/**

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* Convert RGB color code to HEX code.

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* @param array $rgb

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* @return bool|string

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function wpml_rgb_to_hex( $rgb ) {

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if ( ! is_array( $rgb ) || count( $rgb ) < 3 ) {

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return false;

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}

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$hex = '#';

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$hex .= str_pad( dechex( $rgb[0] ), 2, '0', STR_PAD_LEFT );

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$hex .= str_pad( dechex( $rgb[1] ), 2, '0', STR_PAD_LEFT );

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$hex .= str_pad( dechex( $rgb[2] ), 2, '0', STR_PAD_LEFT );

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return $hex;

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}

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