php - How can i manage my dependencies? -

i'm working on large php project have many classes, , problem appears when classes depends on others, example error-handling class may depend on security class, user class may depend on database class , on...

$obj1 = new class1(); $obj2 = new class2($obj1); $obj3 = new class3(); $obj4 = new class4($obj3 , $obj1); etc... 

hence quesion comes in! best way manage dependancies ?

try autoloading classes. way if class needs class, doesn't have require() it.

http://php.net/manual/en/function.spl-autoload-register.php

example documentation:

<?php  function my_autoloader($class) {     include 'classes/' . $class . '.class.php'; }  spl_autoload_register('my_autoloader');  // or, using anonymous function of php 5.3.0 spl_autoload_register(function ($class) {     include 'classes/' . $class . '.class.php'; });  ?>