3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('1' => true); var_dump(isset($a[1), isset($a['1']));
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.23
Parse error: syntax error, unexpected ')', expecting ']' in /in/ACU7L on line 3
Process exited with code 255.
preferences:
177.92 ms | 1399 KiB | 61 Q