add test

Zend/tests/bug30998.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #30998 (Crash when user error handler returns false)
+--FILE--
+<?php
+error_reporting(-1);
+                           
+function my_error($errno, $errstr, $errfile, $errline)
+{
+        print "$errstr ($errno) in $errfile:$errline\n";
+        return false;
+}
+set_error_handler('my_error');
+                           
+$f = fopen("/tmp/blah", "r");
+?>
+===DONE===
+--EXPECTF--
+fopen(/tmp/blah): failed to open stream: No such file or directory (2) in %s:%d
+
+Warning: fopen(/tmp/blah): failed to open stream: No such file or directory in %s on line %d
+===DONE===