3v4l.org

run code in 300+ PHP versions simultaneously
<?php $content = "<?"; $tokensOldContentLength = 0; $possibleOpenContent = substr($content, $tokensOldContentLength, 5); var_dump($possibleOpenContent);
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.29, 8.0.0 - 8.0.17, 8.1.1 - 8.1.2, 8.1.4 - 8.1.6
string(2) "<?"
Output for 8.0.18 - 8.0.19, 8.1.0, 8.1.3

Process exited with code 137.

preferences:
24.48 ms | 410 KiB | 5 Q