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✏️ Editing: class-link-table-accessible.php

<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin\Links
 */

/**
 * Represents the state of the table being accessible.
 */
class WPSEO_Link_Table_Accessible {

/**
	 * Constant used to determine whether the link table is accessible.
	 *
	 * @var string
	 */
	const ACCESSIBLE = '0';

/**
	 * Constant used to determine whether the link table is inaccessible.
	 *
	 * @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_Link_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_link_table_inaccessible';
	}
}

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