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_wp_json_sanity_check() WP 4.1.0

Perform sanity checks on data that shall be encoded to JSON.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

Mixed. The sanitized data that shall be encoded to JSON.

Usage

_wp_json_sanity_check( $data, $depth );
$data(mixed) (required)
Variable (usually an array or object) to encode as JSON.
$depth(int) (required)
Maximum depth to walk through $data. Must be greater than 0.

Notes

  • See: wp_json_encode()

Changelog

Since 4.1.0 Introduced.

Code of _wp_json_sanity_check() WP 5.7

<?php
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;
}