3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a=0x01; $b=0x02; printf("%x", ($a << $b.$b));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
2a
Output for 7.4.0 - 7.4.33
Deprecated: The behavior of unparenthesized expressions containing both '.' and '>>'/'<<' will change in PHP 8: '<<'/'>>' will take a higher precedence in /in/HNvtq on line 4 400000
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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
400000

preferences:
256.45 ms | 404 KiB | 381 Q