wp-admin/includes/misc.php:610Displays the given administration message.
$messagestring|WP_Errorfunction show_message( $message ) { if ( is_wp_error( $message ) ) { if ( $message->get_error_data() && is_string( $message->get_error_data() ) ) { $message = $message->get_error_message() . ': ' . $message->get_error_data(); } else { $message = $message->get_error_message(); } } echo "<p>$message</p>\n"; wp_ob_end_flush_all(); flush();}Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/misc.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.