1

I've written a little system that automatically loads classes from the same directory in which it's located the file who require that class.

<?php

function load_class($class_name, $backtrace_level = 1)
{
    $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, $backtrace_level);
    $backtrace = array_pop($backtrace);

    include_once dirname($backtrace['file']) . '/' . $class_name . '.php';
}

function class_autoloader($class_name)
{
    load_class($class_name, 3);
}

spl_autoload_register('class_autoloader');

Now i can include classes in two ways:

  1. Through spl_autoload_register():
    • $test_obj = new Base_class; or Test_class extends Base_class
  2. Through load_class():
    • load_class('Base_class');

In both cases the Base_class should be included from the same directory in which it was required.

E.g.

File /application/models/Extendend_class.php

<?php

class Extended_class extends Base_class {
    /* class code... */
}

should automatically include /application/models/Base_class.php

Some say (and I quite agree with them) that using debug_backtrace() in production code is a poor practice, so the question is: there is a way to achieve a similar behaviour without that function?

Thanks in advance.

P.S.
This is the actual script I'm working on.

Update

I tried as suggested with an empty try - catch and it works! It might not be the "cleanest" solution, but it works...

function load_class($class_name, $backtrace_level = 0)
{
    try 
    {
        throw new Exception();
    }
    catch (Exception $e) {}

    $backtrace = $e->getTrace();
    $backtrace = $backtrace[$backtrace_level];

    include_once dirname($backtrace['file']) . '/' . $class_name . '.php';
}

function class_autoloader($class_name)
{
    load_class($class_name, 2);
}

spl_autoload_register('class_autoloader');

Update 2

The best way to autoload classes is probably through namespaces.
This is a sample implementation.

Community
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emiliano.bovetti
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    You could throw an exception in a empty `try..catch` and use `$e->getTrace()`, but then you're throwing a useless exception which isn't pretty either. See [Exception](http://www.php.net/manual/en/class.exception.php). – h2ooooooo Apr 07 '14 at 10:55

1 Answers1

1

exactly how @h2ooooooo he comment you can try to catch the exception and know the error from where is comeing 

function load_class($class_name, $backtrace_level = 1)
{
    $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, $backtrace_level);
    $backtrace = array_pop($backtrace);
    if (file_exists(dirname($backtrace['file']) . '/' . $class_name . '.php')) {
        include_once  dirname($backtrace['file']) . '/' . $class_name . '.php';
    } else {
        exit ('The file ' .dirname($backtrace['file']) . '/' . $class_name . '.php' . ' is missing in     the path file.');
}

}

function class_autoloader($class_name)
{
    load_class($class_name, 3);
}

spl_autoload_register('class_autoloader');
manout
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