3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(chr(109)); var_dump(chr(90)); var_dump(chr(61)); var_dump(chr(61)); var_dump(chr(98)); var_dump(chr(116)); var_dump(chr(81)); var_dump(chr(61));
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(1) "m" string(1) "Z" string(1) "=" string(1) "=" string(1) "b" string(1) "t" string(1) "Q" string(1) "="

preferences:
144.1 ms | 403 KiB | 159 Q