3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function filterLabel($label) { $filtered = key(array(trim($label) => 1)); if ($filtered === false) { throw new UnexpectedValueException('Unable to filter %s', var_export($label, true)); } return $filtered; } $data = array("foo", "0foo", 0, "0", "00", 1, NULL, FALSE, new SimpleXMLElement('<root />')); foreach ($data as $index => $label) { printf("==== %d ====\n", $index); var_dump($label, filterLabel($label)); }
based on TTdCX
Output for 5.1.0 - 7.1.0
==== 0 ==== string(3) "foo" string(3) "foo" ==== 1 ==== string(4) "0foo" string(4) "0foo" ==== 2 ==== int(0) int(0) ==== 3 ==== string(1) "0" int(0) ==== 4 ==== string(2) "00" string(2) "00" ==== 5 ==== int(1) int(1) ==== 6 ==== NULL string(0) "" ==== 7 ==== bool(false) string(0) "" ==== 8 ==== object(SimpleXMLElement)#1 (0) { } string(0) ""
Output for 4.3.2 - 4.4.0, 4.4.2 - 5.0.5
Fatal error: Only variables can be passed by reference in /in/ZEQdJ on line 5
Process exited with code 255.
Output for 4.4.1
Parse error: parse error, unexpected T_NEW in /in/ZEQdJ on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/ZEQdJ on line 5