Detailed explanation of the principle examples of chain operation in PHP

This article mainly introduces the detailed examples of the principles of chain operation in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

There are multiple methods in a class. When you instantiate this class and call the method, you can only call it one by one, similar to:

db.php

<?php

class db
{
public function where()
{
//code here
}
public function order()
{
//code here
}
public function limit()
{
//code here
}
}

index.php

<?php

$db = new db();

$db->where();
$db->order();
$db->limit();

If you want to implement chain calls, you need to add return $this at the end of the method.

db.php

<?php

class db
{
public function where()
{
//code here
return $this;
}
public function order()
{
//code here
return $this;
}
public function limit()
{
//code here
return $this;
}
}

index.php

<?php

$db = new db();

$db->where()->order()->limit();

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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