REST API: Log doing_it_wrong notices to debug.log

Fixes #64260. The doing_it_wrong_trigger_error filter was preventing
all doing_it_wrong notices from being logged during REST requests.
This change ensures notices are written to debug.log while still
preventing trigger_error() from interfering with REST responses.

Author: claudiobat

src/wp-includes/rest-api.php

@@ -245,7 +245,36 @@ function rest_api_default_filters() {
 		add_action( 'deprecated_argument_run', 'rest_handle_deprecated_argument', 10, 3 );
 		add_filter( 'deprecated_argument_trigger_error', '__return_false' );
 		add_action( 'doing_it_wrong_run', 'rest_handle_doing_it_wrong', 10, 3 );
-		add_filter( 'doing_it_wrong_trigger_error', '__return_false' );
+		add_filter( 'doing_it_wrong_trigger_error', 'rest_handle_doing_it_wrong_trigger_error', 10, 4 );
+	}
+
+	/**
+	 * Handles doing_it_wrong errors for REST API requests.
+	 *
+	 * Logs doing_it_wrong notices to the debug log during REST API requests
+	 * while preventing trigger_error() from interfering with JSON responses.
+	 *
+	 * @since 7.0.0
+	 *
+	 * @param bool   $trigger       Whether to trigger an error.
+	 * @param string $function_name The function that was called incorrectly.
+	 * @param string $message       A message explaining what was called incorrectly.
+	 * @param string $version       The version of WordPress where the message was added.
+	 * @return bool Always returns false to prevent trigger_error().
+	 */
+	function rest_handle_doing_it_wrong_trigger_error( $trigger, $function_name, $message, $version ) {
+		if ( defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG ) {
+			$log_message = sprintf(
+				'REST API - Doing it wrong: %s - %s',
+				$function_name,
+				$message
+			);
+			if ( $version ) {
+				$log_message .= sprintf( ' (This message was added in version %s.)', $version );
+			}
+			error_log( $log_message );
+		}
+		return false;
 	}
 
 	// Default serving.