3v4l.org

run code in 300+ PHP versions simultaneously
<?php list($x,$y) = microtime(); $a = ''; for($i=0; $i<1000000; $i++) $a = 'yay'; list($n,$p) = microtime(); echo round((($n+$p)-$x-$y)*1000); list($x,$y) = microtime(); $a = ''; for($i=0; $i<1000000; $i++) $a = "yay"; list($n,$p) = microtime(); echo round((($n+$p)-$x-$y)*1000);
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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.25, 7.3.0 - 7.3.12, 7.4.0
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preferences:
237.17 ms | 404 KiB | 322 Q