PHP - Most Lightweight Psr-0 Compliant Autoloader

PHP - most lightweight psr-0 compliant autoloader

You ask extremely lightweight, let's do so ;)

Timothy Boronczyk wrote a nice minimal SPL autoloader : http://zaemis.blogspot.fr/2012/05/writing-minimal-psr-0-autoloader.html

I condensed the code like this:

function autoload1( $class ) {
    preg_match('/^(.+)?([^\\\\]+)$/U', ltrim( $class, '\\' ), $match ) );
    require str_replace( '\\', '/', $match[ 1 ] )
        . str_replace( [ '\\', '_' ], '/', $match[ 2 ] )
        . '.php';
}

Then compare (minified versions of) this [autoload3] with short @Alix Axel code [autoload4] :

function autoload3($c){preg_match('/^(.+)?([^\\\\]+)$/U',ltrim($c,'\\'),$m);require str_replace('\\','/',$m[1]).str_replace(['\\','_'],'/',$m[2]).'.php';}
function autoload4($c){require (($n=strrpos($c=ltrim($c,'\\'),'\\'))!==false?str_replace('\\','/',substr($c,0,++$n)):null).str_replace('_','/',substr($c,$n)).'.php';}

autoload3 is the shortest !

Let's use stable & extremely lightweight (175b !) autoloader file :

<?php spl_autoload_register(function ($c){preg_match('/^(.+)?([^\\\\]+)$/U',ltrim($c,'\\'),$m);require str_replace('\\','/',$m[1]).str_replace(['\\','_'],'/',$m[2]).'.php';});

Maybe i'm crazy but you Asked for extreme, no?

EDIT: Thanks to Alix Axel, i've shorten the code (only 100b !) and used include instead of require in case you have various autoloading strategy for old libs (and then various autoloader in spl autoload stack...).

<?php spl_autoload_register(function($c){@include preg_replace('#\\\|_(?!.+\\\)#','/',$c).'.php';});

If you want to make it shorter / better, please use this gist.

Can PSR-0 class autoloader, load PEAR library?

PSR-0 should be able to work with both full-qualified namespaces and underscored classes. All you should need to do is replace the underscores with a directory seperator. A good example would be:

function autoload($className)
{
    $className = ltrim($className, '\\');
    $fileName  = '';
    $namespace = '';
    if ($lastNsPos = strripos($className, '\\')) {
        $namespace = substr($className, 0, $lastNsPos);
        $className = substr($className, $lastNsPos + 1);
        $fileName  = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
    }
    $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';

    require $fileName;
}

Hope this helps!

php psr-0 restful webservice library

Silex is very similar to Slim but with much better architecture IMO and it is psr-0 compliant.

Php syntax error syntax error, unexpected '[', expecting ')' str_replace, PSR-0 Autoloader

You are using php 5.4 array notation, it's not supported in lower PHP versions.
Change it to

$classname = str_replace("\\", "/", $match[1])
        . str_replace(array("\\", "_"), "/", $match[2])
        . ".php";

---

Related Topics