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<?php /** * WPSEO plugin file. * * @package WPSEO\Internals */ /** * Class WPSEO_Validator. */ class WPSEO_Validator { /** * Validates whether the passed variable is a boolean. * * @param mixed $variable The variable to validate. * * @return bool Whether or not the passed variable is a valid boolean. */ public static function is_boolean( $variable ) { if ( is_bool( $variable ) ) { return true; } return filter_var( $variable, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE ) !== null; } /** * Validates whether the passed variable is a string. * * @param mixed $variable The variable to validate. * * @return bool Whether or not the passed variable is a string. */ public static function is_string( $variable ) { return is_string( $variable ); } /** * Validates whether the passed variable is a non-empty string. * * @param mixed $variable The variable to validate. * * @return bool Whether or not the passed value is a non-empty string. */ public static function is_non_empty_string( $variable ) { return self::is_string( $variable ) && $variable !== ''; } /** * Validates whether the passed variable is an integer. * * @param mixed $variable The variable to validate. * * @return bool Whether or not the passed variable is an integer. */ public static function is_integer( $variable ) { return filter_var( $variable, FILTER_VALIDATE_INT ) || filter_var( $variable, FILTER_VALIDATE_INT ) === 0; } /** * Determines whether a particular key exists within the passed dataset. * * @param array $data The dataset to search through. * @param string $key The key to search for. * * @return bool Whether or not the key exists. */ public static function key_exists( array $data, $key ) { return array_key_exists( $key, $data ); } }