php - 通过扩展类在其外部使用wordpress 4.0？

Question

我正在尝试在 WordPress 之外的脚本上使用 WordPress 函数和 $wbdb，但我不知道该怎么做。

我尝试过:

require_once('./wp-load.php' ); // this is the correct path is tested.
class cron extends wpdb {    
  public function results(){
      $sql = 'SELECT sub_id,email,cate_id FROM co_subsriber WHERE status = 0 ORDER BY sub_id ASC LIMIT '.$start.',750'; // $start =0
      $records = $wpdb->get_results($sql);
   }
}

我收到错误

Warning: Missing argument 1 for wpdb::__construct(), called in wp-db.php on line 578
Warning: Missing argument 2 for wpdb::__construct() called in wp-db.php on line 578
Warning: Missing argument 3 for wpdb::__construct() called in wp-db.php on line 578
Warning: Missing argument 4 for wpdb::__construct() called in wp-db.php on line 578
Notice: Undefined variable: dbuser wp-db.php on line 602 and all other pass, hostname...

无法选择数据库...

我需要提到这一点

require_once('./wp-load.php' );

并且使用简单的 PHP，没有带有类的 OOP，它可以正常工作。

那么我实际上应该扩展什么类？

Answer 1

问题在于您没有使用正确的参数调用 wpdb 类的构造函数。

你需要做这样的事情:

class cron extends wpdb {

  function __construct() {
    parent::__construct( /* params here */ )
  }

}

但这完全没有必要，因为 $wpdb 已经在 wp-load.php 中实例化了

只需这样做:

require_once('./wp-load.php' );

class Cron {

  private $wpdb;

  function __construct( $wpdb ) {
    $this->wpdb = $wpdb;
  }

  public function results() {
    $sql = 'SELECT sub_id,email,cate_id FROM co_subsriber WHERE status = 0 ORDER BY sub_id ASC LIMIT '.$start.',750'; // $start =0
    $records = $this->wpdb->get_results($sql);
  }
}

现在实例化你的类:

$cron = new Cron( $wpdb );