Databases
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    <p>You just make sure a chainable method returns an object reference, and you can chain another method call onto the result.</p> <p>You can <code>return $this</code> as @Tim Cooper shows, or you can return a reference to another different object:</p> <pre><code>class Hand { protected $numFingers = 5; public function countFingers() { return $this-&gt;numFingers; } } class Arm { protected $hand; public function getHand() { return $this-&gt;hand; } } $n = $body-&gt;getLeftArm() // returns object of type Arm -&gt;getHand() // returns object of type Hand -&gt;countFingers(); // returns integer </code></pre> <p>The PDO example you show uses two different object types. <a href="http://php.net/manual/en/pdo.query.php" rel="nofollow noreferrer"><code>PDO::query()</code></a> instantiates and returns a <a href="http://php.net/manual/en/class.pdostatement.php" rel="nofollow noreferrer"><code>PDOStatement</code></a> object, which in turn has a <a href="http://php.net/manual/en/pdostatement.fetch.php" rel="nofollow noreferrer"><code>fetch()</code></a> method.</p> <p>This technique can also be used for a <a href="http://en.wikipedia.org/wiki/Fluent_interface#PHP" rel="nofollow noreferrer">fluent interface</a>, particularly when implementing an interface for domain-specific language. Not all method chains are fluent interfaces, though.</p> <p>See what Martin Fowler <a href="http://martinfowler.com/bliki/FluentInterface.html" rel="nofollow noreferrer">wrote about fluent interfaces</a> in 2005. He cites Eric Evans of <a href="http://rads.stackoverflow.com/amzn/click/0321125215" rel="nofollow noreferrer">Domain-Driven Design</a> fame as having come up with the idea.</p>
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    1. POHow to make this in php?
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    1. USBill Karwin
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    1. CO...and being a programmer, having your fingers protected is important for your livelihood ;)
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      1. USWrikken
    2. COThis explains pretty much everything I had to know. Thank you :)
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      1. UStftd
 

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