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Detailed explanation of the principle examples of chain operation in PHP

墨辰丷
墨辰丷Original
2018-06-01 11:12:411629browse

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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