3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array( 'string' => 'my string', 'empty string' => '', 'number' => 5, 'zero' => 0, 'null' => null, 'array' => array(1, 2, 3), 'empty_array' => array(), ); foreach ($arr as $key => $value) { echo $key, ' is ', (isset($arr[$key]) ? 'set' : 'not set'); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string is setempty string is setnumber is setzero is setnull is not setarray is setempty_array is set
preferences:
198.78 ms | 406 KiB | 314 Q