Merge branch 'pull-request/1414' into PHP-7.1

* Add subject to mail.log

Author: krakjoe

ext/standard/mail.c

@@ -294,7 +294,7 @@ PHPAPI int php_mail(char *to, char *subject, char *message, char *headers, char
 		time(&curtime);
 		date_str = php_format_date("d-M-Y H:i:s e", 13, curtime, 1);
 
-		l = spprintf(&tmp, 0, "[%s] mail() on [%s:%d]: To: %s -- Headers: %s\n", ZSTR_VAL(date_str), zend_get_executed_filename(), zend_get_executed_lineno(), to, hdr ? hdr : "");
+		l = spprintf(&tmp, 0, "[%s] mail() on [%s:%d]: To: %s -- Headers: %s -- Subject: %s\n", ZSTR_VAL(date_str), zend_get_executed_filename(), zend_get_executed_lineno(), to, hdr ? hdr : "", subject);
 
 		zend_string_free(date_str);