3v4l.org

run code in 300+ PHP versions simultaneously
<?php $name = "survey_que3"; $key=explode("survey_que",$name); print_r(array_filter($key,null));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [1] => 3 )
Output for 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 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_filter() expects parameter 2 to be a valid callback, no array or string given in /in/cVFPu on line 7
Output for 4.3.2 - 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
Warning: array_filter(): The second argument, '', should be a valid callback in /in/cVFPu on line 7
Output for 4.3.0 - 4.3.1
Warning: array_filter() [http://www.php.net/function.array-filter]: The second argument, '', should be a valid callback in /in/cVFPu on line 7

preferences:
235.13 ms | 401 KiB | 329 Q