cvs: phpdoc /en/language/oop5 typehinting.xml

From:	Aidan Lister	Date:	Sun, 03 Oct 2004 04:36:36 +0000
Subject:	cvs: phpdoc /en/language/oop5 typehinting.xml
Groups:	php.doc
Request:	Send a blank email to phpdoc+get-969364388@lists.php.net to get a copy of this message

aidan Sun Oct 3 00:36:36 2004 EDT Added files: /phpdoc/en/language/oop5 typehinting.xml Log: Initial Commit http://cvs.php.net/co.php/phpdoc/en/language/oop5/typehinting.xml?r=1.1&p=1 Index: phpdoc/en/language/oop5/typehinting.xml +++ phpdoc/en/language/oop5/typehinting.xml <?xml version="1.0" encoding="iso-8859-1"?>  <sect1 id="language.oop5.typehinting"> <title>Type Hinting</title> <para> PHP 5 introduces Type Hinting. Methods are now able to force parameters to be objects by specifying the name of the class in the function prototype. </para> <example> <title>Type Hinting example</title> <programlisting role="php"> <![CDATA[ <?php class MyClass { /** * A test function * * First parameter must be an object of type OtherClass */ public function test(OtherClass $otherclass) { echo $otherclass->var; } } class OtherClass { public $var = 'Hello World'; } $myclass = new MyClass; // These are fatal errors // Argument 1 must be an object of class OtherClass $myclass->test('hello'); // Argument 1 must be an instance of OtherClass $foo = new stdClass; $myclass->test($foo); // Argument 1 must not be null $myclass->test(null); // This is fine $foo = new OtherClass; // Prints Hello World $myclass->test($foo); ?> ]]> </programlisting> </example> </sect1>