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Description

void spl_autoload ( string class_name [, string file_extensions] )

This function is intended to be used as a default implementation for __autoload(). If nothing else is specified and autoload_register() is called without any parameters then this functions will be used for any later call to __autoload(). By default it checks all include paths to contain failnames built up by the lowercase class name appended by the filename extensions .inc and .php.

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spl_autoload

safak_ozpinar at NOSPAM dot yahoo dot com
25-Sep-2007 07:17


Note that, the orders of file extensions is important for performance. You should make the priority of your favourite file extension higest or use only one extension for your class files. 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

?>



Or you can use this simple function that runs a bit faster for the extensions with lower priority :)

<?php

function my_autoload($className, $extList='.inc,.php') {

    $ext = explode(',',$extList);

    foreach($ext as $x) {

        $fname = $className.$x;

        if(@file_exists($fname)) {

            require_once($fname);

            return true;

        }

    }

    return false;

}



for($n=65; $n<70; $n++) {

    $className = 'Class'.chr($n);

    my_autoload($className);

    $ins = new $className;

    echo $ins->val.'<br>';

}

// 2.6 miliseconds

?>

---

Safak Ozpinar - Istanbul University, Computer Engineering

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