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run code in 500+ PHP versions simultaneously
<?php // First script $a = 1; echo $a + $a++; // may print either 2 or 3 => Finally, no, it always print 3 echo "\n"; // Second script $i = 1; $array[$i] = $i++; // may set either index 1 or 2 => Same here, array will always contain index 2 and value 1 var_export($array);
Output for 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 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
3 array ( 2 => 1, )
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
2 array ( 1 => 1, )
preferences:
31.79 ms | 1140 KiB | 9 Q