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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 );
}
}