3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(bin2hex(pack('E', pi())));
Output for 7.3.0 - 7.3.30, 7.4.0 - 7.4.23, 8.0.0 - 8.0.11, 8.1rc1 - rc2
string(16) "400921fb54442d18"

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27.93 ms | 459 KiB | 5 Q