Introducing coding standards validation.

vendor/wp-coding-standards/wpcs/WordPress/Sniffs/PHP/DontExtractSniff.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * WordPress Coding Standard.
+ *
+ * @package WPCS\WordPressCodingStandards
+ * @link    https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards
+ * @license https://opensource.org/licenses/MIT MIT
+ */
+
+namespace WordPress\Sniffs\PHP;
+
+use WordPress\AbstractFunctionRestrictionsSniff;
+
+/**
+ * Restricts the usage of extract().
+ *
+ * @link    https://make.wordpress.org/core/handbook/best-practices/coding-standards/php/#dont-extract
+ *
+ * @package WPCS\WordPressCodingStandards
+ *
+ * @since   0.10.0 Previously this check was contained within WordPress_Sniffs_VIP_RestrictedFunctionsSniff.
+ * @since   0.13.0 Class name changed: this class is now namespaced.
+ * @since   1.0.0  This sniff has been moved from the `Functions` category to the `PHP` category.
+ */
+class DontExtractSniff extends AbstractFunctionRestrictionsSniff {
+
+	/**
+	 * Groups of functions to restrict.
+	 *
+	 * Example: groups => array(
+	 *  'lambda' => array(
+	 *      'type'      => 'error' | 'warning',
+	 *      'message'   => 'Use anonymous functions instead please!',
+	 *      'functions' => array( 'file_get_contents', 'create_function' ),
+	 *  )
+	 * )
+	 *
+	 * @return array
+	 */
+	public function getGroups() {
+		return array(
+
+			'extract' => array(
+				'type'      => 'error',
+				'message'   => '%s() usage is highly discouraged, due to the complexity and unintended issues it might cause.',
+				'functions' => array(
+					'extract',
+				),
+			),
+
+		);
+	}
+
+}