installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/includes/database/engine/class-schema.php

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+<?php
+/**
+ * Base Custom Database Table Schema Class.
+ *
+ * @package     Database
+ * @subpackage  Schema
+ * @copyright   Copyright (c) 2020
+ * @license     https://opensource.org/licenses/gpl-2.0.php GNU Public License
+ * @since       1.0.0
+ */
+namespace EDD\Database;
+
+// Exit if accessed directly
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * A base database table schema class, which houses the collection of columns
+ * that a table is made out of.
+ *
+ * This class is intended to be extended for each unique database table,
+ * including global tables for multisite, and users tables.
+ *
+ * @since 1.0.0
+ */
+class Schema extends Base {
+
+	/**
+	 * Array of database column objects to turn into Column.
+	 *
+	 * @since 1.0.0
+	 * @var   array
+	 */
+	protected $columns = array();
+
+	/**
+	 * Invoke new column objects based on array of column data.
+	 *
+	 * @since 1.0.0
+	 */
+	public function __construct() {
+
+		// Bail if no columns
+		if ( empty( $this->columns ) || ! is_array( $this->columns ) ) {
+			return;
+		}
+
+		// Juggle original columns array
+		$columns = $this->columns;
+		$this->columns = array();
+
+		// Loop through columns and create objects from them
+		foreach ( $columns as $column ) {
+			if ( is_array( $column ) ) {
+				$this->columns[] = new Column( $column );
+			} elseif ( $column instanceof Column ) {
+				$this->columns[] = $column;
+			}
+		}
+	}
+
+	/**
+	 * Return the schema in string form.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return string Calls get_create_string() on every column.
+	 */
+	protected function to_string() {
+
+		// Default return value
+		$retval = '';
+
+		// Bail if no columns to convert
+		if ( empty( $this->columns ) ) {
+			return $retval;
+		}
+
+		// Loop through columns...
+		foreach ( $this->columns as $column_info ) {
+			if ( method_exists( $column_info, 'get_create_string' ) ) {
+				$retval .= '\n' . $column_info->get_create_string() . ', ';
+			}
+		}
+
+		// Return the string
+		return $retval;
+	}
+}