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wp_json_encode() WP 1.0

Encode a variable into JSON, with some sanity checks.

Is the basis for: wp_send_json()

No Hooks.

Return

String/false. The JSON encoded string, or false if it cannot be encoded.

Usage

wp_json_encode( $data, $options, $depth );
$data(mixed) (required)
Variable (usually an array or object) to encode as JSON.
$options(int)
Options to be passed to json_encode().
Default: 0
$depth(int)
Maximum depth to walk through $data. Must be greater than 0.
Default: 512

Code of wp_json_encode: wp-includes/functions.php VER 4.9.8

<?php
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 );
	}

	// Prepare the data for JSON serialization.
	$args[0] = _wp_json_prepare_data( $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 );
}

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