Online PHP editor | output for Qt5Nf

<?php $haystack = "I like cats."; $needles = ['cat' => 0, 'dog' => 1]; function inefficient(string $haystack, array $needles) { $qualifiers = array_filter( $needles, fn($k) => strpos($haystack, $k) !== false, ARRAY_FILTER_USE_KEY ); if (!$qualifiers) { throw new Exception('No needles were found in the haystack'); } return current($qualifiers); } try { var_export(inefficient($haystack, $needles)); } catch (Exception $e) { echo $e->getMessage(); }