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run code in 150+ php & hhvm versions
Bugs & Features
<?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 $gTree; } } function display_parent_nodes($tree, $id) { $current = $tree[$id]; $parent_id = $current === NULL ? "NULL" : $current; $parents = array(); while (isset($tree[$parent_id])) { $current = $tree[$parent_id]; $parent_id = $current === NULL ? "NULL" : $current; $parents[] = $parent_id; } echo implode(" > ", array_reverse($parents)); } $treeByParent = array( 0 => array(1, 2), 1 => array(3, 7), 3 => array(4), 4 => array(5), 5 => array(6, 8) ); $treeByCat = array( 1 => 0, 2 => 0, 3 => 1, 7 => 1, 4 => 3, 5 => 4, 6 => 5, 8 => 5 ); print_r( display_parent_nodes($treeByCat, 4) ); //print_r( getTree($treeByParent, $treeByCat, 4, 0) );
Output for 5.4.0 - 7.1.0
0 > 1
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/FXeFb on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/FXeFb on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/FXeFb on line 6
Process exited with code 255.