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call_user_method_array> <Classes/Object Functions
[edit] Last updated: Fri, 28 Jun 2013

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__autoload

(PHP 5)

__autoloadAttempt to load undefined class

Description

void __autoload ( string $class )

You can define this function to enable classes autoloading.

Parameters

class

Name of the class to load

Return Values

No value is returned.

See Also



call_user_method_array> <Classes/Object Functions
[edit] Last updated: Fri, 28 Jun 2013
 
add a note add a note User Contributed Notes __autoload - [3 notes]
up
13
qeremy
1 year ago
Even I have never been using this function, just a simple example in order to explain it;

./myClass.php
<?php
class myClass {
    public function
__construct() {
        echo
"myClass init'ed successfuly!!!";
    }
}
?>

./index.php
<?php
// we've writen this code where we need
function __autoload($classname) {
   
$filename = "./". $classname .".php";
    include_once(
$filename);
}

// we've called a class ***
$obj = new myClass();
?>

*** At this line, our "./myClass.php" will be included! This is the magic that we're wondering... And you get this result "myClass init'ed successfuly!!!".

So, if you call a class that named as myClass then a file will be included myClass.php if it exists (if not you get an include error normally). If you call Foo, Foo.php will be included, and so on...

And you don't need some code like this anymore;

<?php
include_once("./myClass.php");
include_once(
"./myFoo.php");
include_once(
"./myBar.php");

$obj = new myClass();
$foo = new Foo();
$bar = new Bar();
?>

Your class files will be included "automatically" when you call (init) them without these functions: "include, include_once, require, require_once".
up
1
keyboardSmasher
2 months ago
qeremy, your code is incorrect.

<?php
include_once("./myClass.php");
include_once(
"./myFoo.php");
include_once(
"./myBar.php");

$obj = new myClass();
$foo = new Foo();
$bar = new Bar();
?>

<?php
$foo
= new Foo();
$bar = new Bar();
?>

should be:

<?php
$foo
= new myFoo();
$bar = new myBar();
?>
up
0
wojciech.fornal@gmail,com
24 days ago
keyboardSmasher

You may or may not be right as the file name doesn't necessarily have to reflect a class name it contains (but it's usually considered a good practice). It isn't always a straightforward mapping (look at some PHP frameworks and autoload implementations).

File myBar.php may contain the class:

class Bar {
}

or it even contain the class:

class Foo {
}

Best regards

 
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