khaihihi

wp-content/plugins/wordpress-seo/inc/class-wpseo-validator.php

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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 );
+	}
+}