Online PHP editor | rfc for MNJVj

@ 2013-10-11T16:10:25Z

<?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 find_by_key($array, $key) {
    if(array_key_exists($key, $array)) {
        return $array[$key];
    }
    else {
        foreach($array as $sub) {
            if(FALSE !== ($found = find_by_key($sub, $key))) {
                return $found;
            }
        }
    }

    return FALSE;
}

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

    return $out;
}

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

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, string given in /in/MNJVj:47 Stack trace: #0 /in/MNJVj(52): find_by_key('test 1', 77) #1 /in/MNJVj(52): find_by_key(Array, 77) #2 /in/MNJVj(68): find_by_key(Array, 77) #3 /in/MNJVj(77): v2(Array) #4 {main} thrown in /in/MNJVj on line 47
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
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