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📄 CapsuleManagerTrait.php(1.4 KB)
📄 EnumeratesValues.php(24.6 KB)
📄 ForwardsCalls.php(1.34 KB)
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📄 Macroable.php(2.7 KB)
📄 ReflectsClosures.php(1.43 KB)
📄 Tappable.php(315 B)

Editing: ReflectsClosures.php

<?php

namespace Illuminate\Support\Traits;

use Closure;
use Illuminate\Support\Reflector;
use ReflectionFunction;
use RuntimeException;

trait ReflectsClosures
{
    /**
     * Get the class names / types of the parameters of the given Closure.
     *
     * @param  \Closure  $closure
     * @return array
     *
     * @throws \ReflectionException
     */
    protected function closureParameterTypes(Closure $closure)
    {
        $reflection = new ReflectionFunction($closure);

return collect($reflection->getParameters())->mapWithKeys(function ($parameter) {
            if ($parameter->isVariadic()) {
                return [$parameter->getName() => null];
            }

return [$parameter->getName() => Reflector::getParameterClassName($parameter)];
        })->all();
    }

/**
     * Get the class name of the first parameter of the given Closure.
     *
     * @param  \Closure  $closure
     * @return string
     *
     * @throws \ReflectionException|\RuntimeException
     */
    protected function firstClosureParameterType(Closure $closure)
    {
        $types = array_values($this->closureParameterTypes($closure));

if (! $types) {
            throw new RuntimeException('The given Closure has no parameters.');
        }

if ($types[0] === null) {
            throw new RuntimeException('The first parameter of the given Closure is missing a type hint.');
        }

return $types[0];
    }
}

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Editing: ReflectsClosures.php

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