Suppose I have classes in same namespaces:
directory :
(folder) a
- a.php
(folder) b
- b.php
- c.php
and we use namespace and __autoload
as you see: in folder b\\b.php
:
<?php
namespace b;
use b as x;
function __autoload($clsName){
$clsName='../'.str_replace('\\', '/', $clsName).'.php';
require_once $clsName;
}
class b{
function __construct(){
print("b file<hr/>");
}
}
$t=new x\c(); // line 13
?>
and in folder b\\c.php
:
<?php
namespace b;
class c{
function __construct(){
print("c file<hr/>");
}
}
?>
when we define $t=new x\\c
, __autoload
doesn't call! please help me :(
error message:
Fatal error: Class 'b\c' not found in C:\xampp\htdocs\project\TEST\b\b.php on line 13
You have not defined autoloader. PHP looks for __autoload
(or \\__autoload
- function defined in global namespace) while you have defined only \\b\\__autoload
(yes, functions are namespaced to!)
How to fix it: move __autoload
declaration outside namespace
Better fix: you should use spl_autoload_register
It's hard to see exactly what is going wrong. By the looks of the error, it appears that the __autoload()
function isn't being called. If it was I would expect the require_once
statement to fail with an error saying file not found, or something like that.
You could try by putting some debugging statements in your __autoload()
function to see what's going on, including a var_dump
of your $clsName
variable.
It might be worth noting the following message that appears in the PHP manual regarding autoloading :
spl_autoload_register() provides a more flexible alternative for autoloading classes. For this reason, using __autoload() is discouraged and may be deprecated or removed in the future.
You should also note, that there is a "standard" for PHP autoloading, called PSR-0 . Here is a link to an article that gives a good explanation of it.
In both the article and the PSR-0 document mentioned above, are example autoloaders that you can use. I would suggest using one of these than trying to implement your own.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.