Online PHP editor | output for 4IQkM

@ 2013-10-11T16:38:24Z

<?php

$array = array(
   55 => array(
       'ident' => 'test 1',
       'depth' => 1,
   ),
   77 => array(
       'parent_id' => 55,
       'ident' => 'test 2',
       'depth' => 2,
   ),
   109 => array(
       'parent_id' => 77,
       'ident' => 'test 3',
       'depth' => 3,
   ),
   78 => array(
       'parent_id' => 55,
       'ident' => 'test 4',
       'depth' => 2,
   ),
   25 => array(
       'ident' => 'test 5',
       'depth' => 1,
   )
);

function v1($array) {
    foreach ($array as $key => &$sub) {
        if (isset($sub['parent_id'])) {
            $array[$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 ($array as $key => $sub) {
        if (isset($sub['parent_id'])) 
            unset($array[$key]);
    }

    return $array;
}

function push_at_key($what, $what_key, $key, $array) {
    foreach($array as $k => $v) {
        if($key == $k) {
            $array[$k]['children'][$what_key] = $what;
            return $array;
        }
    }

    //foreach($array as $sub) {
    //    if(isset($sub['children']) && FALSE !== ($found = push_at_key($what, $what_key, $key, $sub['children']))) {
    //        return $found;
    //    }
    //}

    return FALSE;
}

function v2($array) {
    $out = array();
	foreach ($array as $key => $sub) {
        if(!isset($sub['parent_id'])) {
			$out[$key] = $sub;
        }
        else {
            $out = push_at_key($sub, $key, $sub['parent_id'], $out);
        }
    }

    return $out;
}

//var_dump(v1($array));
var_dump(v2($array));

Output for 8.3.0 - 8.3.6: Warning: foreach() argument must be of type array|object, false given in /in/4IQkM on line 47 Deprecated: Automatic conversion of false to array is deprecated in /in/4IQkM on line 67 array(1) { [25]=> array(2) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) } }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18: Warning: foreach() argument must be of type array|object, bool given in /in/4IQkM on line 47 Deprecated: Automatic conversion of false to array is deprecated in /in/4IQkM on line 67 array(1) { [25]=> array(2) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) } }
Output for 8.0.0 - 8.0.30: Warning: foreach() argument must be of type array|object, bool given in /in/4IQkM on line 47 array(1) { [25]=> array(2) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) } }
Output for 5.0.0 - 5.0.5, 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 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: Invalid argument supplied for foreach() in /in/4IQkM on line 47 array(1) { [25]=> array(2) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) } }
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/4IQkM on line 30
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/4IQkM on line 30
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/4IQkM on line 30
Process exited with code 255.

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