Online PHP editor | refs for Y3aoM

<?php $css_current = ['test6' => 1, 'test2' => 2, 'test3' => 3]; $css_original = ['test5' => 5, 'test3' => 3, 'test4' => 4]; $css_result = []; foreach ($css_current as $name => $data) { if (!isset($css_original[$name])) { $css_result[$name] = $data; } } var_dump($css_result); $css_result = []; $css_result = array_diff_key($css_current, $css_original); var_dump($css_result);