Problems with PHP namespaces and built-in classes, how to fix?

Question

I'm writing a small library in PHP and i'm having some problems with built-in classes not being read. For example:

namespace Woody;

class Test {
  public function __construct() {
    $db = new PDO(params);
  }
}

This gives me:

PHP Fatal error: Class 'Woody\PDO' not found in /var/www/test.php

This is probably the same: How to use “root” namespace of php? — hakre
– hakre, Commented Aug 1, 2011 at 16:35

hakre · Accepted Answer · 2011-08-01 16:39:38Z

38

This:

namespace Woody;
use PDO;

Or:

$db = new \PDO(params);

Point in case is, that the class PDO is not a full qualified name within your Namespace, so PHP would look for Woody\PDO which is not available.

See Name resolution rules^Docs for a detailed description how class names are resolved to a Fully qualified name.

edited Aug 1, 2011 at 16:39

answered Aug 1, 2011 at 16:21

hakre

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3 Comments

Steve Hill Over a year ago

thanks for a better answer than my own. I knew the solution, but I didn't explain it nearly as well as you did!

Jo Smo Over a year ago

The \PDO method doesn't work for me in PHP 5.5.12, but this does: use PDO;.

hakre Over a year ago

@tastro: I think as well that using use is good practice. Then you can see at the top of the file which classes are taken in.

ain · Accepted Answer · 2011-08-01 16:29:44Z

6

Add a backslash before class name, ie

$db = new \PDO(params);

edited Aug 1, 2011 at 16:29

answered Aug 1, 2011 at 16:21

ain

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Comments

Steve Hill · Accepted Answer · 2011-08-01 16:22:38Z

3

The below should work:

namespace Woody;

class Test {
    public function __construct() {
        $db = new \PDO(params);
    }
}

You need to prefix PDO with the backslash so PHP knows it's in the global namespace.

answered Aug 1, 2011 at 16:22

Steve Hill

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