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PHP implements the principle of chain operation

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Sep 19, 2016 am 08:55 AM

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

db.php

1	`<?php<br /><br />class` `db<br />{<br />` `public` `function` `where()<br /> {<br />` `//code here<br /> }<br /> public function order()<br /> {<br /> //code here<br /> }<br /> public function limit()<br /> {<br /> //code here<br /> }<br />}`

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index.php

1	`<?php<br /><br />$db` `=` `new` `db();<br /><br />$db->where();<br>$db->order();<br>$db->limit();`

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If you want to implement chained calls, just 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; } }

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index.php

1	`<?php<br /><br />$db` `=` `new` `db();<br /><br />$db->where()->order()->limit();`

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