Added memory limit test

tests/023-php-allocators.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Test PHP emalloc/erealloc/efree
+--SKIPIF--
+<?php require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (!Imagick::USE_ZEND_MM)
+	die ('skip Only active when compiled with --enable-imagick-zend-mm');
+?>
+--FILE--
+<?php
+ini_set ('memory_limit', '1M');
+
+$im = new imagick ();
+for ($i = 0; $i < 100; $i++)
+	$im->readImage ('magick:rose');
+
+
+?>
+--EXPECTF--
+Fatal error: Allowed memory size of %d bytes exhausted (tried to allocate %d bytes) in %s on line %d