Analysis of Realization Mode of php Chain Operation

This paper describes the implementation of php chain operation with examples. Share it for your reference, as follows:

Similar $db->where("id=1")->limit("5")->order("id desc") The implementation of chain operation

First, let's talk about the general call of methods;

namespace Com;
class Database{
  function where($where){
    echo $where;
  }
  function order($order){
    echo $order;
  }
  function limit($limit){
    echo $limit;
  }
}

Call

$db = new \Com\Database();
$db->where();
$db->limit();

Disadvantages: Implementing multiple methods requires multiple line calls;

Chain operation, when the method returns return $this; Chain operation can be used;

namespace Com;
class Database{
  function where($where){
    echo $where;
    return $this;
  }
  function order($order){
    echo $order;
    return $this;
  }
  function limit($limit){
    echo $limit;
    return $this;
  }
}

Using chain calls:

$db = new \Com\Database();
$db->where("id=1")->limit("5")->order("id desc");

More readers interested in PHP can check out the topics on this site: "Introduction to php Object-Oriented Programming", "Encyclopedia of PHP Array (Array) Operation Skills", "Introduction to PHP Basic Syntax", "Summary of PHP Operation and Operator Usage", "Summary of php String (string) Usage", "Introduction to php+mysql Database Operation" and "Summary of php Common Database Operation Skills"

I hope this article is helpful to everyone's PHP programming.