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<?php function getTree($treeByParent, $treeByCat, $id, $listed = []) { $gTree = []; $gTree[] = $treeByCat[ $id ]; if ( count($treeByParent[ $id ]) > 0) { foreach ($treeByParent[ $id ] as $cat) $gTree[] = $cat; } if ( count($treeByCat[ $treeByCat[$id] ]) > 0 ) getTree($treeByParent, $treeByCat, $treeByCat[ $treeByCat[$id] ]); return $gTree; } $treeByParent = array( 0 => array(1, 2), 1 => array(3, 7), 3 => array(4), 4 => array(5) ); $treeByCat = array( 1 => 0, 2 => 0, 3 => 1, 7 => 1, 4 => 3, 5 => 4 ); print_r( getTree($treeByParent, $treeByCat, 3) );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, int given in /in/05Yea:15 Stack trace: #0 /in/05Yea(42): getTree(Array, Array, 3) #1 {main} thrown in /in/05Yea on line 15
Process exited with code 255.

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