Fixed bug #50240 (pdo_mysql.default_socket in php.ini shouldn't used if it is empty).

NEWS

@@ -24,6 +24,8 @@ PHP                                                                        NEWS
 - Fixed memory leak in extension loading when an error occurs on Windows.
   (Pierre)
 
+- Fixed bug #50240 (pdo_mysql.default_socket in php.ini shouldn't used
+  if it is empty). (foutrelis at gmail dot com, Ilia)
 - Fixed bug #50219 (soap call Segmentation fault on a redirected url).
   (Pierrick)
 - Fixed bug #50212 (crash by ldap_get_option() with LDAP_OPT_NETWORK_TIMEOUT).

ext/pdo_mysql/pdo_mysql.c

@@ -52,7 +52,7 @@ ZEND_DECLARE_MODULE_GLOBALS(pdo_mysql);
 */
 PHP_INI_BEGIN()
 #ifndef PHP_WIN32
-	STD_PHP_INI_ENTRY("pdo_mysql.default_socket", PDO_MYSQL_UNIX_ADDR, PHP_INI_SYSTEM, OnUpdateString, default_socket, zend_pdo_mysql_globals, pdo_mysql_globals)
+	STD_PHP_INI_ENTRY("pdo_mysql.default_socket", PDO_MYSQL_UNIX_ADDR, PHP_INI_SYSTEM, OnUpdateStringUnempty, default_socket, zend_pdo_mysql_globals, pdo_mysql_globals)
 #endif
 #if PDO_DBG_ENABLED
 	STD_PHP_INI_ENTRY("pdo_mysql.debug",	NULL, PHP_INI_SYSTEM, OnUpdateString, debug, zend_pdo_mysql_globals, pdo_mysql_globals)