Intelephense is showing Undefined Type errors that are not true

Question

Windows 11: 24h2 VS Code: 1.102.1 (WSL: Ubuntu 24.04.2 LTS) Intelephense: 1.14.4 Symfony: v6.4.23 PHP: 8.2.28

<?php

namespace App\Command;

use Doctrine\Bundle\FixturesBundle\Fixture;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Console\Attribute\AsCommand;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

#[AsCommand(
    name: 'app:fixtures:load-one',
    description: 'Load a single Doctrine fixture by class name',
)]

All of the symfony classes are highlighted with a red line by Intelephense. The above snippet shows that the AsCommand has been included but the line #[AsCommand( shows an error of:

Undefined type 'Symfony\Component\Console\Attribute\AsCommand'.intelephense(P1009)
class Symfony\Component\Console\Attribute\AsCommand
function AsCommand::__construct(
    string $name,
    string|null $description = null,
    array $aliases = [],
    bool $hidden = false
)
Service tag to autoconfigure commands

I am seeing the exact same error from:

• class ClassName extends Command
  • Undefined type 'Symfony\Component\Console\Command\Command'.intelephense(P1009)
• parent::__construct();
  • Undefined type 'Symfony\Component\Console\Command\Command'.intelephense(P1009)
• $this->addArgument(...);
  • Undefined method 'addArgument'.intelephense(P1013)
• protected function execute(InputInterface $input, OutputInterface $output): int
  • Undefined type 'Symfony\Component\Console\Input\InputInterface'.intelephense(P1009)
  • Undefined type 'Symfony\Component\Console\Output\OutputInterface'.intelephense(P1009)

I have tried:

• Restarting
  • laptop
  • PHP
  • Symfony:server
  • VS Code
• Force Intelephense to reindex
• Regenerate autoloader (composer dump-autoload --optimize)

I only have two options left that I can think of that include removing intelephense or specifically applying a setting that stops this (which seems pointless as then its not doing its job) "intelephense.diagnostics.undefinedTypes": false,

Answer 1

Within the Intelephense plugin there is a setting to exclude files from language server features

@ext:bmewburn.vscode-intelephense-client exc

Within these exclusions I found the **/vendor/** folder. This plugin and its settings were shared with me by the previous developer and as such I was unaware of this.

The basic premise being the Intelephense was unaware of all of the symfony classes as it was unable to index that location.

Whilst looking to resolve this I have seen multiple people having similar issues with other PHP Frameworks that do not have an answer, so I will mention this post anywhere else I see that problem in the hope it will fix those too (CakePHP and Laravel being the ones I have seen)