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<?php abstract class Filter { abstract public static function check($value, array $options = array()); } final class IntFilter { public static function check($value, array $options = array()) { return $value; } } final class StringFilter { public static function check($value, array $options = array()) { if (false === is_string($value)) { return false; } if (false !== ($options['trim'] ?? true)) { $value = trim($value); } $length = mb_strlen($value, '8bit'); if ((false === ($options['empty'] ?? true)) && (0 === $length)) { return false; } foreach (['min', 'max', 'size'] as $name) { $sign = ['min' => '<', 'max' => '>', 'size' => '!==']; if (isset($options[$name])) { $optionLength = IntFilter::check($options[$name], ['min' => 1]); if ($length $sign[$name] $optionLength) { return false; } } } foreach (['startsWith', 'endsWith'] as $name) { if (isset($options[$name])) { $needle = StringFilter::check($options[$name]); if (false === self::$name($value, $needle)) { return false; } } } return $value; } private static function startsWith($haystack, $needle) { return $haystack[0] === $needle[0] ? strncmp($haystack, $needle, mb_strlen($needle, '8bit')) === 0 : false; } private static function endsWith($haystack, $needle) { $length = mb_strlen($needle, '8bit'); $haystack = mb_substr($haystack, -$length); return $haystack[0] === $needle[0] ? strncmp($haystack, $needle, $length) === 0 : false; } } var_dump(StringFilter::check(' r a ', ['min' => 1])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'r'])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'z'])); var_dump(StringFilter::check(' r a ', ['endsWith' => 'a'])); var_dump(StringFilter::check(' r a ', ['endsWith' => 'z'])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'r', 'endsWith' => 'a'])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'r', 'endsWith' => 'z'])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'z', 'endsWith' => 'a'])); var_dump(StringFilter::check(' r a ', ['startsWith' => 'z', 'endsWith' => 'y']));