Fixed bug #75355: preg_quote() does not quote # control character

NEWS

@@ -93,6 +93,8 @@ PHP                                                                        NEWS
 
 - PCRE:
   . Implemented https://wiki.php.net/rfc/pcre2-migration (Anatol, Dmitry)
+  . Fixed bug #75355 (preg_quote() does not quote # control character).
+    (Michael Moravec)
 
 - PDO_DBlib:
   . Implemented request #69592 (allow 0-column rowsets to be skipped
@@ -109,6 +111,10 @@ PHP                                                                        NEWS
 - PDO SQLite
   . Add support for additional open flags
 
+- PCRE:
+  . Fixed bug #75355 (preg_quote() does not quote # control character).
+    (Majkl578)
+
 - phar:
   . Fixed bug #74991 (include_path has a 4096 char limit in some cases).
     (bwbroersma)

ext/pcre/php_pcre.c

@@ -2629,6 +2629,7 @@ static PHP_FUNCTION(preg_quote)
 			case '|':
 			case ':':
 			case '-':
+			case '#':
 				extra_len++;
 				break;
 
@@ -2678,6 +2679,7 @@ static PHP_FUNCTION(preg_quote)
 			case '|':
 			case ':':
 			case '-':
+			case '#':
 				*q++ = '\\';
 				*q++ = c;
 				break;

ext/pcre/tests/bug75355.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #75355 (preg_quote() does not quote # control character)
+--FILE--
+<?php
+
+var_dump(preg_quote('#'));
+
+var_dump(preg_match('~^(' . preg_quote('hello#world', '~') . ')\z~x', 'hello#world', $m));
+
+var_dump($m[1]);
+?>
+--EXPECT--
+string(2) "\#"
+int(1)
+string(11) "hello#world"