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@ 2014-05-25T22:41:51Z

<?php

function getTree($treeByParent, $treeByCat, $id, $lastId) {


    $gTree = [];

    if ($id != $lastId) {
    	$gTree[] = $id;

    	if ( isset($treeByCat[ $id ]) && count($treeByCat[ $id ]) > 0 ) $gTree = array_merge( getTree($treeByParent, $treeByCat, $treeByCat[ $id ], $id), $gTree);

    	if ( isset($treeByParent[ $id ]) && count($treeByParent[ $id ]) > 0 ) {

        	foreach ($treeByParent[ $id ] as $cat) $gTree = array_merge( getTree($treeByParent, $treeByCat, $cat, $id), $gTree);

    	}

    	return $gTree;
	}
}


$treeByParent = array(

    0 => array(1, 2),
    1 => array(3, 7),
    3 => array(4),
    4 => array(5),
    5 => array(6, 8)

);

$treeByCat = array(

	1 => 0,
    2 => 0,
    3 => 1,
    7 => 1,
    4 => 3,
    5 => 4,
    6 => 5,
    8 => 5

);

print_r( getTree($treeByParent, $treeByCat, 4) );

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught ArgumentCountError: Too few arguments to function getTree(), 3 passed in /in/b35Gf on line 47 and exactly 4 expected in /in/b35Gf:3 Stack trace: #0 /in/b35Gf(47): getTree(Array, Array, 4) #1 {main} thrown in /in/b35Gf on line 3
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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