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);
Output for git.master, git.master_jit, rfc.literals, rfc.partials
Fatal error: Uncaught Error: Undefined constant "i" in /in/eg4cn:6 Stack trace: #0 {main} thrown in /in/eg4cn on line 6
Process exited with code 255.

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