HTML Purifier和spl_autoload_register

Question

Folders of my Page

system/ <-- offline files (classes, cronjobs, libraries ...)
online/ <-- contain all php scripts ( available online )

system/

classes <-- all my own classes inside.
... directories ...
libraries/htmlpurifier <- contain HTMLPurifier

I want to use spl_autoload_register()

<?php

define("DOC_ROOT", dirname(__DIR__));

function hTMLPurifier($class) {
 require DOC_ROOT . '/system/libraries/htmlpurifier/library/' . strtolower(str_replace('\\', '/', $class)) . '.php';
 }

 function myAutoload($class) {
 require DOC_ROOT . '/' . strtolower(str_replace('\\', '/', $class)) . '.php';
 }

spl_autoload_register('hTMLPurifier');
spl_autoload_register('myAutoload');


$config = HTMLPurifier_Config::createDefault();
$purifier = new HTMLPurifier($config);
$clean_html = $purifier->purify($dirty_html);
?>

I get follow message.

 .../htmlpurifier_config.php): failed to open stream: No such file or directory in ...

If insert

  "require_once '/path/to/HTMLPurifier.auto.php';"

on Top

<?php

define("DOC_ROOT", dirname(__DIR__));
require_once '/path/to/HTMLPurifier.auto.php';

function myAutoload($class) {
  require DOC_ROOT . '/' . strtolower(str_replace('\\', '/', $class)) . '.php';
 }


 spl_autoload_register('myAutoload');


 $config = HTMLPurifier_Config::createDefault();
 $purifier = new HTMLPurifier($config);
 $clean_html = $purifier->purify($dirty_html);
 ?>

Everything is work.

I want to load all classes with spl_autoload_register() only without insert

"require_once '/path/to/HTMLPurifier.auto.php';" 

on top. How can, i do it???

Answer 1

HTML Purifier doesn't work with PHP namespaces, so substituting \\ with / won't net you the results you seek. Your autoload logic is trying to load the class HTMLPurifier_Config from the file htmlpurifier_config.php - so what you want is something like this:

function autoloadHtmlPurifier($class) {
    require DOC_ROOT . '/system/libraries/htmlpurifier/library/'
        . str_replace('_', '/', $class) . '.php';
}
spl_autoload_register('autoloadHtmlPurifier');

(Notice how this function doesn't use strtolower() and replaces _ with /.)

But, looking at the HTML Purifier autoload implementation:

public static function getPath($class)
{
    if (strncmp('HTMLPurifier', $class, 12) !== 0) {
        return false;
    }
    // Custom implementations
    if (strncmp('HTMLPurifier_Language_', $class, 22) === 0) {
        $code = str_replace('_', '-', substr($class, 22));
        $file = 'HTMLPurifier/Language/classes/' . $code . '.php';
    } else {
        $file = str_replace('_', '/', $class) . '.php';
    }
    if (!file_exists(HTMLPURIFIER_PREFIX . '/' . $file)) {
        return false;
    }
    return $file;
 }

...there's a good chance the simple replacement will still not function correctly, because of the language class edge case. But you could try this:

function autoloadHtmlPurifier($class) {
    require DOC_ROOT . '/system/libraries/htmlpurifier/library/'
        . str_replace('_', '/', $class) . '.php';
}
spl_autoload_register('autoloadHtmlPurifier');
spl_autoload_register(array('HTMLPurifier_Bootstrap', 'autoload'));

That uses your custom autoloader to load the HTMLPurifier_Bootstrap class, so you don't need to include it with require, but still have the benefit of using the canonical autoloader for HTML Purifier.

Word of caution

That said, in either case, the downside is that if HTML Purifier ever does switch to namespaces, your autoloader for it will break. I would really suggest you stick to the require_once(DOC_ROOT . '/system/libraries/htmlpurifier/library/HTMLPurifier.auto.php') approach, or install HTML Purifier using composer, which will take care of autoloading that library (and possibly others) for you:

For libraries that specify autoload information, Composer generates a vendor/autoload.php file. You can simply include this file and start using the classes that those libraries provide without any extra work:

require __DIR__ . '/vendor/autoload.php';