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wp-content/plugins/mailchimp-for-wp/includes/admin/class-upgrade-routines.php

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+<?php
+
+/**
+ * Class MC4WP_DB_Upgrader
+ *
+ * This class takes care of loading migration files from the specified migrations directory.
+ * Migration files should only use default WP functions and NOT use code which might not be there in the future.
+ *
+ * @ignore
+ */
+class MC4WP_Upgrade_Routines {
+
+
+	/**
+	 * @var float
+	 */
+	protected $version_from = 0;
+
+	/**
+	 * @var float
+	 */
+	protected $version_to = 0;
+
+	/**
+	 * @var string
+	 */
+	protected $migrations_dir = '';
+
+	/**
+	 * @param float $from
+	 * @param float $to
+	 */
+	public function __construct( $from, $to, $migrations_dir ) {
+		$this->version_from   = $from;
+		$this->version_to     = $to;
+		$this->migrations_dir = $migrations_dir;
+	}
+
+	/**
+	 * Run the various upgrade routines, all the way up to the latest version
+	 */
+	public function run() {
+		$migrations = $this->find_migrations();
+
+		// run in sub-function for scope
+		array_map( array( $this, 'run_migration' ), $migrations );
+	}
+
+	/**
+	 * @return array
+	 */
+	public function find_migrations() {
+		$files      = glob( rtrim( $this->migrations_dir, '/' ) . '/*.php' );
+		$migrations = array();
+
+		// return empty array when glob returns non-array value.
+		if ( ! is_array( $files ) ) {
+			return $migrations;
+		}
+
+		foreach ( $files as $file ) {
+			$migration = basename( $file );
+			$parts     = explode( '-', $migration );
+			$version   = $parts[0];
+
+			if ( version_compare( $this->version_from, $version, '<' ) ) {
+				$migrations[] = $file;
+			}
+		}
+
+		return $migrations;
+	}
+
+	/**
+	 * Include a migration file and runs it.
+	 *
+	 * @param string $file
+	 */
+	protected function run_migration( $file ) {
+		include $file;
+	}
+}