InputValidator

19final class InputValidator {20 21	/**22	 * Verify that a received input parameter is of type string or is "stringable".23	 *24	 * @param mixed $input Input parameter to verify.25	 *26	 * @return bool27	 */28	public static function is_string_or_stringable($input) {29		return is_string($input) || self::is_stringable_object($input);30	}31 32	/**33	 * Verify whether a received input parameter is usable as an integer array key.34	 *35	 * @param mixed $input Input parameter to verify.36	 *37	 * @return bool38	 */39	public static function is_numeric_array_key($input) {40		if (is_int($input)) {41			return true;42		}43 44		if (!is_string($input)) {45			return false;46		}47 48		return (bool) preg_match('`^-?[0-9]+$`', $input);49	}50 51	/**52	 * Verify whether a received input parameter is "stringable".53	 *54	 * @param mixed $input Input parameter to verify.55	 *56	 * @return bool57	 */58	public static function is_stringable_object($input) {59		return is_object($input) && method_exists($input, '__toString');60	}61 62	/**63	 * Verify whether a received input parameter is _accessible as if it were an array_.64	 *65	 * @param mixed $input Input parameter to verify.66	 *67	 * @return bool68	 */69	public static function has_array_access($input) {70		return is_array($input) || $input instanceof ArrayAccess;71	}72 73	/**74	 * Verify whether a received input parameter is "iterable".75	 *76	 * @internal The PHP native `is_iterable()` function was only introduced in PHP 7.177	 * and this library still supports PHP 5.6.78	 *79	 * @param mixed $input Input parameter to verify.80	 *81	 * @return bool82	 */83	public static function is_iterable($input) {84		return is_array($input) || $input instanceof Traversable;85	}86 87	/**88	 * Verify whether a received input parameter is a Curl handle.89	 *90	 * The PHP Curl extension worked with resources prior to PHP 8.0 and with91	 * an instance of the `CurlHandle` class since PHP 8.0.92	 * {@link https://www.php.net/manual/en/migration80.incompatible.php#migration80.incompatible.resource2object}93	 *94	 * @param mixed $input Input parameter to verify.95	 *96	 * @return bool97	 */98	public static function is_curl_handle($input) {