overload

(PHP 4 >= 4.3.0)

overload — Enable property and method call overloading for a class

说明

void overload ( string $class_name )

The overload() function will enable property and method call overloading for a class identified by class_name.

参数

class_name: The overloaded class name, as a string

返回值

没有返回值。

范例

See an example in the introductory section of this part.

PHP手册 - N: Enable property and method call overloading for a class

用户评论:

admin at skewedconcepts dot ca (07-Apr-2012 06:07)

PHP does not have method overloading as with other languages. The only option is to use optional arguments. This is a better testing scenario as described in the other post: <?php class Test { function Test($name = "stranger") { echo "Hello, $name"; } } $t1=new Test(); // Output : Hello, stranger $t2=new Test('Osman Kalache'); // Output : Hello, Osman Kalache ?>

osminosm at gmail dot com (22-Jan-2009 03:22)

creating two methods with the same name won't work for sure (maybe in next versions i hope) but for now all i could come up with something that looks like overloaded functions from the outside but still makes it a bit difficult for the one who's coding the actual class as we can see in the code bellow i've used a default value for the $name argument, so when the Test() method is called with no arguments the $name argument is by default passed as NULL (or any value you wanna pass) <?php class Test { function Test($name=NULL) { echo 'Hello, '; if($name) { echo $name.'<br>'; } else { echo 'stranger<br>'; } } } $t1=new Test(); // Output : Hello, stranger $t2=new Test('Osman Kalache'); // Output : Hello, Osman Kalache ?> the bad side of this trick is that you have to test your arguments (imagine how many IFs and ELSEs you get if you had just 5 arguments) but still makes your classes easy to use.