Online PHP editor | output for EBg92

@ 2013-11-25T14:13:49Z

<?php

$tree = array(
   1 => array(
       'parent_id' => null,
       'name' => 'root',
       'depth' => 0,
   ),
   11 => array(
       'parent_id' => 1,
       'name' => 'a',
       'depth' => 1,
   ),
   12 => array(
       'parent_id' => 1,
       'name' => 'b',
       'depth' => 1,
   ),
   111 => array(
       'parent_id' => 11,
       'name' => 'aa',
       'depth' => 2,
   ),
   2 => array(
       'parent_id' => null,
       'name' => 'other root',
       'depth' => 0,
   )
);

foreach ($tree as $key => &$sub) {
    if (isset($sub['parent_id'])) {
        $tree[$sub['parent_id']]['children'][$key] = &$sub;
    }
}
unset($sub); // unset the reference to make sure to not overwrite it later...

// now remove the entries with parents
foreach ($tree as $key => $sub) {
    if (isset($sub['parent_id'])) 
        unset($tree[$key]);
}
var_dump(json_encode($tree));

Output for 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 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: string(256) "{"1":{"parent_id":null,"name":"root","depth":0,"children":{"11":{"parent_id":1,"name":"a","depth":1,"children":{"111":{"parent_id":11,"name":"aa","depth":2}}},"12":{"parent_id":1,"name":"b","depth":1}}},"2":{"parent_id":null,"name":"other root","depth":0}}"
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Call to undefined function json_encode() in /in/EBg92 on line 43
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/EBg92 on line 31
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/EBg92 on line 31
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/EBg92 on line 31
Process exited with code 255.

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