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<?php
/**
* Cornerstone makes use of functions from more recent versions of WordPress.
* This file provides them to outdated WordPress installations.
* It is highly advisable that if you have any installs running outdated versions of
* WordPress that you update as soon as possible. This is one of the best defenses in
* keeping your site secure. You can read about WordPress release history here:
* https://codex.wordpress.org/WordPress_Versions
*/
if ( ! function_exists( 'wp_json_encode' ) && ! function_exists( '_wp_json_sanity_check' ) && ! function_exists( '_wp_json_convert_string' ) ) :
/**
* Encode a variable into JSON, with some sanity checks.
*
* @since 4.1.0
*
* @param mixed $data Variable (usually an array or object) to encode as JSON.
* @param int $options Optional. Options to be passed to json_encode(). Default 0.
* @param int $depth Optional. Maximum depth to walk through $data. Must be
* greater than 0. Default 512.
* @return string|false The JSON encoded string, or false if it cannot be encoded.
*/
function wp_json_encode( $data, $options = 0, $depth = 512 ) {
/*
* json_encode() has had extra params added over the years.
* $options was added in 5.3, and $depth in 5.5.
* We need to make sure we call it with the correct arguments.
*/
if ( version_compare( PHP_VERSION, '5.5', '>=' ) ) {
$args = array( $data, $options, $depth );
} elseif ( version_compare( PHP_VERSION, '5.3', '>=' ) ) {
$args = array( $data, $options );
} else {
$args = array( $data );
}
$json = call_user_func_array( 'json_encode', $args );
// If json_encode() was successful, no need to do more sanity checking.
// ... unless we're in an old version of PHP, and json_encode() returned
// a string containing 'null'. Then we need to do more sanity checking.
if ( false !== $json && ( version_compare( PHP_VERSION, '5.5', '>=' ) || false === strpos( $json, 'null' ) ) ) {
return $json;
}
try {
$args[0] = _wp_json_sanity_check( $data, $depth );
} catch ( Exception $e ) {
return false;
}
return call_user_func_array( 'json_encode', $args );
}
/**
* Perform sanity checks on data that shall be encoded to JSON.
*
* @ignore
* @since 4.1.0
* @access private
*
* @see wp_json_encode()
*
* @param mixed $data Variable (usually an array or object) to encode as JSON.
* @param int $depth Maximum depth to walk through $data. Must be greater than 0.
* @return mixed The sanitized data that shall be encoded to JSON.
*/
function _wp_json_sanity_check( $data, $depth ) {
if ( $depth < 0 ) {
throw new Exception( 'Reached depth limit' );
}
if ( is_array( $data ) ) {
$output = array();
foreach ( $data as $id => $el ) {
// Don't forget to sanitize the ID!
if ( is_string( $id ) ) {
$clean_id = _wp_json_convert_string( $id );
} else {
$clean_id = $id;
}
// Check the element type, so that we're only recursing if we really have to.
if ( is_array( $el ) || is_object( $el ) ) {
$output[ $clean_id ] = _wp_json_sanity_check( $el, $depth - 1 );
} elseif ( is_string( $el ) ) {
$output[ $clean_id ] = _wp_json_convert_string( $el );
} else {
$output[ $clean_id ] = $el;
}
}
} elseif ( is_object( $data ) ) {
$output = new stdClass;
foreach ( $data as $id => $el ) {
if ( is_string( $id ) ) {
$clean_id = _wp_json_convert_string( $id );
} else {
$clean_id = $id;
}
if ( is_array( $el ) || is_object( $el ) ) {
$output->$clean_id = _wp_json_sanity_check( $el, $depth - 1 );
} elseif ( is_string( $el ) ) {
$output->$clean_id = _wp_json_convert_string( $el );
} else {
$output->$clean_id = $el;
}
}
} elseif ( is_string( $data ) ) {
return _wp_json_convert_string( $data );
} else {
return $data;
}
return $output;
}
/**
* Convert a string to UTF-8, so that it can be safely encoded to JSON.
*
* @ignore
* @since 4.1.0
* @access private
*
* @see _wp_json_sanity_check()
*
* @staticvar bool $use_mb
*
* @param string $string The string which is to be converted.
* @return string The checked string.
*/
function _wp_json_convert_string( $string ) {
static $use_mb = null;
if ( is_null( $use_mb ) ) {
$use_mb = function_exists( 'mb_convert_encoding' );
}
if ( $use_mb ) {
$encoding = mb_detect_encoding( $string, mb_detect_order(), true );
if ( $encoding ) {
return mb_convert_encoding( $string, 'UTF-8', $encoding );
} else {
return mb_convert_encoding( $string, 'UTF-8', 'UTF-8' );
}
} else {
return wp_check_invalid_utf8( $string, true );
}
}
endif;
if ( ! function_exists( 'wp_scripts' ) ) :
/**
* Initialize $wp_scripts if it has not been set.
*
* @global WP_Scripts $wp_scripts
*
* @since 4.2.0
*
* @return WP_Scripts WP_Scripts instance.
*/
function wp_scripts() {
global $wp_scripts;
if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
$wp_scripts = new WP_Scripts(); // WPCS: override ok.
}
return $wp_scripts;
}
endif;
if ( ! function_exists( 'wp_styles' ) ) :
/**
* Initialize $wp_styles if it has not been set.
*
* @global WP_Styles $wp_styles
*
* @since 4.2.0
*
* @return WP_Styles WP_Styles instance.
*/
function wp_styles() {
global $wp_styles;
if ( ! ( $wp_styles instanceof WP_Styles ) ) {
$wp_styles = new WP_Styles();
}
return $wp_styles;
}
endif;