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Edit File: class-upgrade-routines.php

<?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 string
     */
    protected $version_from;

/**
     * @var string
     */
    protected $version_to;

/**
     * @var string
     */
    protected $migrations_dir;

/**
     * @param string $from
     * @param string $to
     * @param string $migrations_dir
     */
    public function __construct($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([ $this, 'run_migration' ], $migrations);
    }

/**
     * @return array
     */
    public function find_migrations()
    {
        $files      = glob(rtrim($this->migrations_dir, '/') . '/*.php');
        $migrations = [];

// 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;
    }
}

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