Class.php

<?php

namespace S3PmxiCompatibility;

class S3PmxiCompatibility {
  /** WP All Import Views */
  public $views = [
    'pmxi-admin-import',
    'pmxi-admin-manage',
    'pmxi-admin-settings',
    'pmxi-admin-history',
    'pmxe-admin-import',
    'pmxe-admin-manage',
    'pmxe-admin-settings',
    'pmxe-admin-history',
  ];

  /** S3 Uploads Plugin path */
  public $s3 = 's3-uploads/s3-uploads.php';

  /**
   * Deactivate the S3 Uploads Plugin (if active).
   */
  public function deactivateS3() {
    if ( !function_exists( 'is_plugin_active' ) ) {
      include_once ABSPATH . 'wp-admin/includes/plugin.php';
    }

    if ( is_plugin_active( $this->s3 ) ) {
      deactivate_plugins( $this->s3 );
    }
  }

  /**
   * Activates the S3 Uploads plugin if it exists and the constants are
   * defined in the WP Configuration.
   *
   * @return  [WP_Error|null]  WP_Error on invalid file or 'NULL' on success
   */
  public function activateS3() {
    if ( is_admin() &&
      file_exists( WP_PLUGIN_DIR . '/' . $this->s3 ) &&
      defined( 'S3_UPLOADS_BUCKET' ) &&
      defined( 'S3_UPLOADS_KEY' ) &&
      defined( 'S3_UPLOADS_SECRET' ) &&
      defined( 'S3_UPLOADS_REGION' ) ) {
      return activate_plugin( $this->s3 );
    }
  }
}