Online PHP editor | output for Tj1Dk

<?php error_reporting(E_ALL); function getCollectionParentIDFromChildID($cID) { if(is_numeric($cID)) { if($cID > 1) { return '1'; } if($cID == 1) { return '0'; } } return null; } function populateParentIDArray_current($cID) { global $cParentIDArray; $cParentID = getCollectionParentIDFromChildID($cID); if($cParentID > -1) { if(!in_array($cParentID, $cParentIDArray)) { $cParentIDArray[] = $cParentID; } populateParentIDArray_current($cParentID); } } function populateParentIDArray_new($cID) { global $cParentIDArray; $cParentID = getCollectionParentIDFromChildID($cID); if(is_numeric($cParentID)) { if(!in_array($cParentID, $cParentIDArray)) { $cParentIDArray[] = $cParentID; } if($cParentID > 0) { populateParentIDArray_new($cParentID); } } } function runTest($cID) { global $cParentIDArray; echo "Test case for "; var_dump($cID); $cParentIDArray = array(); populateParentIDArray_current($cID); ob_start(); var_dump($cParentIDArray); $current = ob_get_contents(); ob_end_clean(); $cParentIDArray = array(); populateParentIDArray_new($cID); ob_start(); var_dump($cParentIDArray); $new = ob_get_contents(); ob_end_clean(); if($current === $new) { echo "Passed: ", $current; } else { echo "###ERROR\nCURRENT: ", $current, "\nNEW: ", $new, "\n"; } } runTest('3'); runTest('1'); runTest('0'); runTest(3); runTest(1); runTest(0); runTest(null); runTest('');