Introducing coding standards validation.

vendor/wp-coding-standards/wpcs/WordPress/Sniffs/Variables/GlobalVariablesSniff.php

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+<?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\Variables;
+
+use WordPress\Sniff;
+use PHP_CodeSniffer_Tokens as Tokens;
+
+/**
+ * Warns about overwriting WordPress native global variables.
+ *
+ * @package WPCS\WordPressCodingStandards
+ *
+ * @since   0.3.0
+ * @since   0.4.0  This class now extends WordPress_Sniff.
+ * @since   0.12.0 The $wp_globals property has been moved to the WordPress_Sniff.
+ * @since   0.13.0 Class name changed: this class is now namespaced.
+ *
+ * @deprecated 1.0.0  This sniff has been moved to the `WP` category.
+ *                    This file remains for now to prevent BC breaks.
+ *
+ * @uses \WordPress\Sniff::$custom_test_class_whitelist
+ */
+class GlobalVariablesSniff extends \WordPress\Sniffs\WP\GlobalVariablesOverrideSniff {
+
+	/**
+	 * Keep track of whether the warnings have been thrown to prevent
+	 * the messages being thrown for every token triggering the sniff.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @var array
+	 */
+	private $thrown = array(
+		'DeprecatedSniff'                 => false,
+		'FoundPropertyForDeprecatedSniff' => false,
+	);
+
+	/**
+	 * Don't use.
+	 *
+	 * @deprecated 1.0.0
+	 *
+	 * @param int $stackPtr The position of the current token in the stack.
+	 *
+	 * @return void|int
+	 */
+	public function process_token( $stackPtr ) {
+		if ( false === $this->thrown['DeprecatedSniff'] ) {
+			$this->thrown['DeprecatedSniff'] = $this->phpcsFile->addWarning(
+				'The "WordPress.Variables.GlobalVariables" sniff has been renamed to "WordPress.WP.GlobalVariablesOverride". Please update your custom ruleset.',
+				0,
+				'DeprecatedSniff'
+			);
+		}
+
+		if ( ! empty( $this->custom_test_class_whitelist )
+			&& false === $this->thrown['FoundPropertyForDeprecatedSniff']
+		) {
+			$this->thrown['FoundPropertyForDeprecatedSniff'] = $this->phpcsFile->addWarning(
+				'The "WordPress.Variables.GlobalVariables" sniff has been renamed to "WordPress.WP.GlobalVariablesOverride". Please update your custom ruleset.',
+				0,
+				'FoundPropertyForDeprecatedSniff'
+			);
+		}
+
+		return parent::process_token( $stackPtr );
+	}
+
+}

vendor/wp-coding-standards/wpcs/WordPress/Sniffs/Variables/VariableRestrictionsSniff.php

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+<?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\Variables;
+
+use WordPress\AbstractVariableRestrictionsSniff;
+
+/**
+ * Restricts usage of some variables.
+ *
+ * @package    WPCS\WordPressCodingStandards
+ *
+ * @since      0.3.0
+ * @since      0.13.0 Class name changed: this class is now namespaced.
+ *
+ * @deprecated 0.10.0 The functionality which used to be contained in this class has been moved to
+ *                    the WordPress_AbstractVariableRestrictionsSniff class.
+ *                    This class is left here to prevent backward-compatibility breaks for
+ *                    custom sniffs extending the old class and references to this
+ *                    sniff from custom phpcs.xml files.
+ *                    This file is also still used to unit test the abstract class.
+ * @see        \WordPress\AbstractVariableRestrictionsSniff
+ */
+class VariableRestrictionsSniff extends AbstractVariableRestrictionsSniff {
+
+	/**
+	 * Groups of variables to restrict.
+	 *
+	 * Example: groups => array(
+	 *  'wpdb' => array(
+	 *      'type'          => 'error' | 'warning',
+	 *      'message'       => 'Dont use this one please!',
+	 *      'variables'     => array( '$val', '$var' ),
+	 *      'object_vars'   => array( '$foo->bar', .. ),
+	 *      'array_members' => array( '$foo['bar']', .. ),
+	 *  )
+	 * )
+	 *
+	 * @return array
+	 */
+	public function getGroups() {
+		return array();
+	}
+
+}