3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $time = [0, 0, 0, 0];for($i = 0; $i < 50; ++$i){ $k = 0; $t = microtime(true); $x = 0; for($j = 0; $j < 10000000; ++$j) ++$x; $time[$k++] += microtime(true) - $t; $t = microtime(true); $x = 0; for($j = 0; $j < 10000000; ++$j) $x++; $time[$k++] += microtime(true) - $t; $t = microtime(true); $x = 0; for($j = 0; $j < 10000000; ++$j) $x += 1; $time[$k++] += microtime(true) - $t; $t = microtime(true); $x = 0; for($j = 0; $j < 10000000; ++$j) $x = $x + 1; $time[$k++] += microtime(true) - $t; } echo '++$x: ', $time[0] * 1000, 'ms<br />'; echo '$x++: ', $time[1] * 1000, 'ms<br />'; echo '$x += 1: ', $time[2] * 1000, 'ms<br />'; echo '$x = $x + 1: ', $time[3] * 1000, 'ms<br />';
based on MQRZK
Output for 5.4.0 - 7.1.0

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/43MJd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/43MJd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/43MJd on line 3
Process exited with code 255.