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msd2/wordpress/wp-content/plugins/wordpress-seo/admin/class-meta-table-accessible.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin\Links
+ */
+
+/**
+ * Represents the state of the table being accessible.
+ */
+class WPSEO_Meta_Table_Accessible {
+
+	/**
+	 * @var string
+	 */
+	const ACCESSIBLE = '0';
+
+	/**
+	 * @var string
+	 */
+	const INACCESSBILE = '1';
+
+	/**
+	 * Checks if the given table name exists.
+	 *
+	 * @return bool True when table is accessible.
+	 */
+	public static function is_accessible() {
+		$value = get_transient( self::transient_name() );
+
+		// If the value is not set, check the table.
+		if ( false === $value ) {
+			return self::check_table();
+		}
+
+		return $value === self::ACCESSIBLE;
+	}
+
+	/**
+	 * Sets the transient value to 1, to indicate the table is not accessible.
+	 *
+	 * @return void
+	 */
+	public static function set_inaccessible() {
+		set_transient( self::transient_name(), self::INACCESSBILE, HOUR_IN_SECONDS );
+	}
+
+	/**
+	 * Removes the transient.
+	 *
+	 * @return void
+	 */
+	public static function cleanup() {
+		delete_transient( self::transient_name() );
+	}
+
+	/**
+	 * Sets the transient value to 0, to indicate the table is accessible.
+	 *
+	 * @return void
+	 */
+	protected static function set_accessible() {
+		/*
+		 * Prefer to set a 0 timeout, but if the timeout was set before WordPress will not delete the transient
+		 * correctly when overridden with a zero value.
+		 *
+		 * Setting a YEAR_IN_SECONDS instead.
+		 */
+		set_transient( self::transient_name(), self::ACCESSIBLE, YEAR_IN_SECONDS );
+	}
+
+	/**
+	 * Checks if the table exists if not, set the transient to indicate the inaccessible table.
+	 *
+	 * @return bool True if table is accessible.
+	 */
+	protected static function check_table() {
+		global $wpdb;
+
+		$storage = new WPSEO_Meta_Storage();
+		$query   = $wpdb->prepare( 'SHOW TABLES LIKE %s', $storage->get_table_name() );
+		if ( $wpdb->get_var( $query ) !== $storage->get_table_name() ) {
+			self::set_inaccessible();
+			return false;
+		}
+
+		self::set_accessible();
+		return true;
+	}
+
+	/**
+	 * Returns the name of the transient.
+	 *
+	 * @return string The name of the transient to use.
+	 */
+	protected static function transient_name() {
+		return 'wpseo_meta_table_inaccessible';
+	}
+}