3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "2d9"; $a++; $a++; echo "$a\n"; $a = "2d9"; $a+=2; echo "$a\n"; $a = "2d9"; $a++; echo "$a\n";
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
3 Warning: A non-numeric value encountered in /in/IprLq on line 4 4 2e0
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
3 Notice: A non well formed numeric value encountered in /in/IprLq on line 4 4 2e0
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, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.3.32 - 7.3.33
3 4 2e0
preferences:
252.08 ms | 404 KiB | 328 Q