spl_autoload_extensions

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

spl_autoload_extensions — Register and return default file extensions for spl_autoload

Descrizione

spl_autoload_extensions(?string $file_extensions = null): string

This function can modify and check the file extensions that the built in __autoload() fallback function spl_autoload() will be using.

Nota: There should not be a space between the defined file extensions.

Elenco dei parametri

file_extensions: If null, it simply returns the current list of extensions each separated by comma. To modify the list of file extensions, simply invoke the functions with the new list of file extensions to use in a single string with each extensions separated by comma.

Valori restituiti

A comma delimited list of default file extensions for spl_autoload().

Log delle modifiche

Versione	Descrizione
8.0.0	`file_extensions` is now nullable.

Esempi

Example #1 spl_autoload_extensions() example

<?php
spl_autoload_extensions(".php,.inc");
?>

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User Contributed Notes 2 notes

down

dantedantas at gmail dot com ¶

7 years ago

The order of the extensions influence the velocity of the reply. For example: 

spl_autoload_extensions(".php, .inc");

is more fast than:

spl_autoload_extensions(".inc, .php");

Check out this example:

Some class files:

ClassA.php
<?php class ClassA { var $val = 'Hello from class "ClassA"'; } ?>
ClassB.php
<?php class ClassB { var $val = 'Hello from class "ClassB"'; } ?>
ClassC.php
<?php class ClassC { var $val = 'Hello from class "ClassC"'; } ?>
ClassD.php
<?php class ClassD { var $val = 'Hello from class "ClassD"'; } ?>
ClassE.php
<?php class ClassE { var $val = 'Hello from class "ClassE"'; } ?>

1. Simple:
<?php
// default priority: .inc .php
for($n=65; $n<70; $n++) {
    $className = 'Class'.chr($n);
    spl_autoload($className);
    $ins = new $className;
    echo $ins->val.'<br>';
}
// 4.2 miliseconds
?>

2. Change priority:
<?php
spl_autoload_extensions('.php,.inc');
// new priority: .php .inc
for($n=65; $n<70; $n++) {
    $className = 'Class'.chr($n);
    spl_autoload($className);
    $ins = new $className;
    echo $ins->val.'<br>';
}
// 1.4 miliseconds
?>

down

pim dot stoit at gmail dot com ¶

8 years ago

Extensions doesn't have to start with a dot, spl_autload() will simply append whatever you supply to the basename. The following example will try to load "test.php" first, and "test/index.php" as well:

spl_autoload_register('.php,/index.php');
spl_autoload('Test');

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