<?php /** * Bug #21184 * * PREG returns NULL when it encounters an error. * In this case, it was encountering PREG_BACKTRACK_LIMIT_ERROR. * * @link https://pear.php.net/bugs/bug.php?id=21177 */ class Bug21184 extends AbstractUnitTests { public function testBug21184() { $xml = '<XML_Serializer_Tag>one</XML_Serializer_Tag>'; $this->assertEquals($xml, XML_Util::collapseEmptyTags($xml, XML_UTIL_COLLAPSE_ALL)); } }