3v4l.org

run code in 300+ PHP versions simultaneously
<?php $in = array(); for($i = 1; $i <=5; $i++) { $in[] = i; } $res = array();// Array where we will write result $t = &$res; // Link to first level foreach ($in as $k) { // Walk through source array if (empty($t[$k])) { // Check if current level has required key $t[$k] = array(); // If does not, create empty array there $t = &$t[$k]; // And link to it now. So each time it is link to deepest level. } } unset($t); // Drop link to last (most deep) level var_dump($res);

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
vld0.0280.00315.91
git.master0.0160.01316.78
git.master_jit0.0180.00316.69
rfc.partials0.0240.00316.81
rfc.literals0.0310.00016.88

preferences:
38.07 ms | 454 KiB | 5 Q