LazyOpenStream.php

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<?php
namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

class LazyOpenStream implements StreamInterface
{
    use StreamDecoratorTrait;

    private $filename;

    private $mode;

    public function __construct($filename, $mode)
    {
        $this->filename = $filename;
        $this->mode = $mode;
    }

    protected function createStream()
    {
        return stream_for(try_fopen($this->filename, $this->mode));
    }
}