3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $p = array( 'test' => 7, 'checkbox_2' => 'on', 'checkbox_4' => 'on', 'checkbox_10' => 'on', 'Submit' => '', 'name' => 20, ); foreach ($p as $key => $val) { if (substr($key, 0, strlen('checkbox_')) == 'checkbox_') { echo substr($key, strlen('checkbox_')) . PHP_EOL; } }
Output for 4.3.10 - 4.4.9, 5.0.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2 4 10
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/rFXPN on line 14 2PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/rFXPN on line 14 4PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/rFXPN on line 14 10PHP_EOL