Class 'Symfony\Component\Yaml\Yaml' not found

Question

I've been struggling for the last day now getting the Symfony Yaml parser working in my application.

My composer.json looks like this;

{
"require": {
    "symfony/class-loader": "2.4.*@dev",
    "symfony/yaml": "2.4.*@dev",
    "facebook/php-sdk": "dev-master"
},
"autoload": {
    "psr-0": {
        "MyApp": "src/"
    }
}

I'm using this in my application:

use Symfony\Component\Yaml\Parser;

$parser = new Parser();
var_dump( $parser->parse( file_get_contents('config.yml') ) );

Then I get this error:

( ! ) Fatal error: Class 'Symfony\Component\Yaml\Yaml' not found in /Projects/my-app/web/index.php on line 16

The UniversalClassLoader (from "symfony/class-loader") works perfectly fine, and when I check what namespaces are loaded, the Symfony\Component\Yaml is the first one in the array.

My IDE (PHPStorm) is giving a squiggly line underneath the classname, "Multiple definitions exist". One is going to the real vendor folder, the other one is referring to a file inside the composer.phar file (read-only).

Does anyone know what I'm doing wrong?

Answer 1

Show your bootstrap code. Especially where the autoloader is being created.

In general, you should probably use the composer generated autoload file as opposed to the S2 one.

This works:

require_once __DIR__ . '/../vendor/autoload.php';

use Symfony\Component\Yaml\Parser;

$parser = new Parser();

var_dump( $parser->parse( file_get_contents('config.yml') ) );