PHP parent method override not working (using namespaces)

Question

I have three different files for each part of code. (i use class autoloader). First file (/classes/Test/Foo.php):

<?php
namespace Test;

class Foo
{
  public $id;

  function __construct(int $id)
  {
    $this->id = $id;
  }

  public function get() : string
  {
    return "FOO:" . $this->id;
  }
}

Second file (/classes/Test/Bar.php):

<?php
namespace Test;

class Bar extends Foo
{
  public function get() : string
  {
    return "BAR:" . $this->id;
  } 
}

Third file (/index.php):

<?php
namespace Test;
include "autoloader.php";
$bar = new Bar(1);
echo $bar->get();

When i execute third file i didn't get any output at all, not even error ...but if i put all code in one file it works.

<?php
namespace Test;

class Foo
{
  public $id;

  function __construct(int $id)
  {
    $this->id = $id;
  }

  public function get() : string
  {
    return "FOO:" . $this->id;
  }
}

class Bar extends Foo
{
  public function get() : string
  {
    return "BAR:" . $this->id;
  } 
}

$bar = new Bar(1);
echo $bar->get();

output: BAR:1

What could be the problem?

Autoloader code:

<?php
spl_autoload_register(function($class) {
  require_once $_SERVER['DOCUMENT_ROOT'] . "/classes/" . str_replace("\\", "/", $class) . ".php";
});

You say you're using a class autoloader but I don't see you actually registering it anywhere — iainn, Jun 07 '18 at 11:24
For blank screen, please check your php error log or enable error reporting for your script: error_reporting(E_ALL); ini_set('display_errors', 1); — BenRoob, Jun 07 '18 at 11:25
Possible duplicate of [How do I get PHP errors to display?](https://stackoverflow.com/questions/1053424/how-do-i-get-php-errors-to-display) — iainn, Jun 07 '18 at 11:26

score 0 · Answer 1 · answered Jun 07 '18 at 11:47

The file path required in your autoloader will reflect the classname including the namespace - this needs to exactly match the directory structure on disk.

Within the callback to spl_autoload_register, $class will first be passed in as Test\Bar. This results in it attempting to include the file classes/Test/Bar.php, which doesn't exist. This will be throwing a fatal error - it sounds like your error reporting settings aren't configured to display this.

For the files you've posted, your directory structure needs to look like this:

.
├── classes
│   └── Test
│       ├── Bar.php
│       └── Foo.php
├── autoloader.php
└── index.php

i fogot to wite description correctly, but directory structure is same as you described — Юрий Столов, Jun 07 '18 at 11:50

score 0 · Accepted Answer · answered Jun 07 '18 at 11:48

0

Solved the problem! This code was example, but in actual code, overridden method had different return type (int instead of string).

answered Jun 07 '18 at 11:48

Юрий Столов

17
6

PHP parent method override not working (using namespaces)

2 Answers2