wp-includes/functions.php:4042Kills WordPress execution and displays Ajax response with an error message.
$messagestring$titlestringoptional''$argsstring|arrayoptionalarray()function _ajax_wp_die_handler( $message, $title = '', $args = array() ) { // Set default 'response' to 200 for Ajax requests. $args = wp_parse_args( $args, array( 'response' => 200 ) ); list( $message, $title, $parsed_args ) = _wp_die_process_input( $message, $title, $args ); if ( ! headers_sent() ) { // This is intentional. For backward-compatibility, support passing null here. if ( null !== $args['response'] ) { status_header( $parsed_args['response'] ); } nocache_headers(); } if ( is_scalar( $message ) ) { $message = (string) $message; } else { $message = '0'; } if ( $parsed_args['exit'] ) { die( $message ); } echo $message;}Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.