From a2bc03b8d8837411ef2cabc9af0511108194b231 Mon Sep 17 00:00:00 2001
From: "James D. Forrester" <jforrester@wikimedia.org>
Date: Sun, 16 Mar 2025 19:11:19 -0400
Subject: [PATCH] MagicWord::replace*: Make sure we don't pass null into
 preg_match/preg_replace

Bug: T388924
Change-Id: I02a3e724dc614f0a2306548f58f71d16a8a1dc5b
(cherry picked from commit 2e4e9428580d4829911313644913c3c74cf43244)
---
 includes/parser/MagicWord.php | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/includes/parser/MagicWord.php b/includes/parser/MagicWord.php
index b21f3a42c0c..f97e95dfbe0 100644
--- a/includes/parser/MagicWord.php
+++ b/includes/parser/MagicWord.php
@@ -178,7 +178,7 @@ class MagicWord {
 	 * @return bool
 	 */
 	public function match( $text ): bool {
-		return (bool)preg_match( $this->getRegex(), $text );
+		return (bool)preg_match( $this->getRegex(), $text ?? '' );
 	}
 
 	/**
@@ -189,7 +189,7 @@ class MagicWord {
 	 * @since 1.23
 	 */
 	public function matchStartToEnd( $text ): bool {
-		return (bool)preg_match( $this->getRegexStartToEnd(), $text );
+		return (bool)preg_match( $this->getRegexStartToEnd(), $text ?? '' );
 	}
 
 	/**
@@ -203,7 +203,7 @@ class MagicWord {
 	 * @return bool
 	 */
 	public function matchAndRemove( &$text ): bool {
-		$text = preg_replace( $this->getRegex(), '', $text, -1, $count );
+		$text = preg_replace( $this->getRegex(), '', $text ?? '', -1, $count );
 		return (bool)$count;
 	}
 
@@ -212,7 +212,7 @@ class MagicWord {
 	 * @return bool
 	 */
 	public function matchStartAndRemove( &$text ): bool {
-		$text = preg_replace( $this->getRegexStart(), '', $text, -1, $count );
+		$text = preg_replace( $this->getRegexStart(), '', $text ?? '', -1, $count );
 		return (bool)$count;
 	}
 
@@ -229,7 +229,7 @@ class MagicWord {
 		$res = preg_replace(
 			$this->getRegex(),
 			StringUtils::escapeRegexReplacement( $replacement ),
-			$subject,
+			$subject ?? '',
 			$limit
 		);
 		return $res;