3v4l.org

run code in 300+ PHP versions simultaneously
<?php $content = "<?"; $tokensOldContentLength = 0; $possibleOpenContent = substr($content, -1, 5); var_dump($possibleOpenContent); var_dump(substr('a', 2));
Output for 8.0.1 - 8.0.19, 8.1.0 - 8.1.6
string(1) "?" string(0) ""
Output for 7.4.0 - 7.4.29
string(1) "?" bool(false)

preferences:
20.23 ms | 409 KiB | 5 Q