CallbackHandler.php

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<?php
namespace Whoops\Handler;
 
use InvalidArgumentException;
 
class CallbackHandler extends Handler
{
    protected $callable;
 
    public function __construct($callable)
    {
        if (!is_callable($callable)) {
            throw new InvalidArgumentException(
                'Argument to ' . __METHOD__ . ' must be valid callable'
            );
        }
 
        $this->callable = $callable;
    }
 
    public function handle()
    {
        $exception = $this->getException();
        $inspector = $this->getInspector();
        $run       = $this->getRun();
        $callable  = $this->callable;
 
        // invoke the callable directly, to get simpler stacktraces (in comparison to call_user_func).
        // this assumes that $callable is a properly typed php-callable, which we check in __construct().
        return $callable($exception, $inspector, $run);
    }
}