src/Uploadcare/Uploader.php
public function fromContent($content, $mime_type)
    {
        $tmpfile = tempnam(sys_get_temp_dir(), 'ucr');
        $temp = fopen($tmpfile, 'w');
        fwrite($temp, $content);
        fclose($temp);

        return $this->fromPath($tmpfile, $mime_type);
    }
public function fromContent($content, $mime_type)
    {
        $tmpfile = tempnam(sys_get_temp_dir(), 'ucr');
        $temp = fopen($tmpfile, 'w');
        fwrite($temp, $content);
        fclose($temp);

        return $this->fromPath($tmpfile, $mime_type);
    }
Upload file from string using mime-type.

@param string $content
@param string $mime_type
@return File
@throws \Exception