3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = "the number of letters in mississippi = 12"; $i=-1; $cp = $input; while( !(ctype_digit($cp[$i++]) ) ) ; echo $i; echo $cp[$i],$cp[$i+1],"\n";
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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
0th
Output for 5.2.10 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Notice: Uninitialized string offset: -1 in /in/QjJY9 on line 6 402 Notice: Uninitialized string offset: 41 in /in/QjJY9 on line 9
Output for 4.4.1 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.9
Notice: Uninitialized string offset: -1 in /in/QjJY9 on line 6 402 Notice: Uninitialized string offset: 41 in /in/QjJY9 on line 9
Output for 4.3.0 - 4.3.11, 4.4.0, 5.0.0 - 5.0.5
Notice: Uninitialized string offset: -1 in /in/QjJY9 on line 6 0th
preferences:
300.98 ms | 402 KiB | 460 Q