3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('a', 'b', 'c'); /*foreach($a as $k=>$v){ if($k==1) unset($a[$k]); echo $k.' => '.$v.' ('.$a[$k].')'.PHP_EOL; }*/ for($k=count($a)-1; $k>=0; $k--){ if($k==1) unset($a[$k]); echo $k.' ('.$a[$k].')'.PHP_EOL; } print_r($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
2 (c) Warning: Undefined array key 1 in /in/T8ZVW on line 15 1 () 0 (a) Array ( [0] => a [2] => c )
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
2 (c) Notice: Undefined offset: 1 in /in/T8ZVW on line 15 1 () 0 (a) Array ( [0] => a [2] => c )
Output for 7.3.32 - 7.3.33
2 (c) 1 () 0 (a) Array ( [0] => a [2] => c )
Output for 4.3.10 - 4.3.11, 4.4.0 - 4.4.9, 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
2 (c) Notice: Undefined offset: 1 in /in/T8ZVW on line 15 1 () 0 (a) Array ( [0] => a [2] => c )
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/T8ZVW on line 15 2 (c)PHP_EOL Notice: Undefined offset: 1 in /in/T8ZVW on line 15 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/T8ZVW on line 15 1 ()PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/T8ZVW on line 15 0 (a)PHP_EOLArray ( [0] => a [2] => c )
preferences:
263.63 ms | 402 KiB | 398 Q