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Edit File: NonExistentDefinedFunctionRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Functions;

use PhpParser\Node;
use PhpParser\Node\Name;
use PhpParser\Node\Stmt\Function_;
use PHPStan\Analyser\Scope;
use PHPStan\Broker\Broker;

class NonExistentDefinedFunctionRule implements \PHPStan\Rules\Rule
{

/** @var \PHPStan\Broker\Broker */
	private $broker;

public function __construct(Broker $broker)
	{
		$this->broker = $broker;
	}

public function getNodeType(): string
	{
		return Function_::class;
	}

/**
	 * @param \PhpParser\Node\Stmt\Function_ $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return string[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		$functionName = $node->name->name;
		if (isset($node->namespacedName)) {
			$functionName = (string) $node->namespacedName;
		}
		$functionNameName = new Name($functionName);
		if ($this->broker->hasFunction($functionNameName, null)) {
			return [];
		}

return [
			sprintf(
				'Function %s not found while trying to analyse it - autoloading is probably not configured properly.',
				$functionName
			),
		];
	}

}