3v4l.org

run code in 300+ PHP versions simultaneously
<?php $stream = fopen("php://temp", "r+"); fwrite($stream, "0123456789"); rewind($stream); var_dump(fread($stream, 1024), ftell($stream), feof($stream));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.20, 5.6.0 - 5.6.4, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
string(10) "0123456789" int(10) bool(true)
Output for 5.5.21 - 5.5.38, 5.6.5 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
string(10) "0123456789" int(10) bool(false)
preferences:
144.8 ms | 407 KiB | 5 Q