3v4l.org

run code in 300+ PHP versions simultaneously
<?php <?php /* A new exponent operator is introduced into PHP 5.6 */ var_dump(2 ** 32); // Pre-5.6 you would need pow(2,32) /* Power-tower is supported */ var_dump(2 ** 3 ** 4); // Pre-5.6 this would be pow(2, pow(3, 4)) but the syntax is much easier than nesting functions
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.25
Parse error: syntax error, unexpected '<' in /in/s3JHX on line 2
Process exited with code 255.
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178.5 ms | 1395 KiB | 62 Q