在PHP中将定义的变量添加到私有类

Question

Why can't I carry a variable ($last_id) into a class?

//get value of last sql row
$last_id = $conn->lastInsertId():
//create class
Class CropAvatar {
  private $id = $last_id;
  private $src;
  private $dstDir = '../some path';
}

private $src and private dstDir works fine.

How can I carry a variable's value into a class?

Answer 1

You could get that value within class like you want. You could achieve your goal by using constructor like below:

Class CropAvatar {

  private $id;
  private $src;
  private $dstDir = '../some path';

  public function __construct($last_id) {
    $this->id = $last_id;
  }

}