Online PHP editor | refs for QWFZ3

<?php declare(strict_types=1); function stringContains(string $needle, string $haystack): bool { return strpos($haystack, $needle) !== false; } assert(stringContains('Ahoy', 'Ahoy World!') === true); assert(stringContains('Hello', 'Ahoy World!') === false); function stringStartsWith(string $needle, string $haystack): bool { return strpos($haystack, $needle) === 0; } assert(stringStartsWith('Ahoy', 'Ahoy World!') === true); assert(stringStartsWith('Hello', 'AhoyWorld') === false); function stringEndsWith(string $needle, string $haystack): bool { return strpos($haystack, $needle) === strlen($haystack) - strlen($needle); } assert(stringEndsWith('World!', 'Ahoy World!') === true); assert(stringEndsWith('Ahoy', 'Ahoy World!') === false);