Swift_ByteStream_TemporaryFileByteStream::getContent PHP Method

    public function getContent()
    {
        if (($content = file_get_contents($this->getPath())) === false) {
            throw new Swift_IoException('Failed to get temporary file content.');
        }
        return $content;
    }

 protected function assertValidVerify($expected, Swift_ByteStream_TemporaryFileByteStream $messageStream)
 {
     $actual = $messageStream->getContent();
     // File is UNIX encoded so convert them to correct line ending
     $expected = str_replace("\n", "\r\n", $expected);
     $actual = trim(self::getBodyOfMessage($actual));
     if (!$this->assertRegExp('%^' . $expected . '$\\s*%m', $actual)) {
         return false;
     }
     $opensslOutput = new Swift_ByteStream_TemporaryFileByteStream();
     $verify = openssl_pkcs7_verify($messageStream->getPath(), null, $opensslOutput->getPath(), array($this->samplesDir . 'smime/ca.crt'));
     if (false === $verify) {
         $this->fail('Verification of the message failed.');
         return false;
     } elseif (-1 === $verify) {
         $this->fail(sprintf('Verification of the message failed. Internal error "%s".', openssl_error_string()));
         return false;
     }
     return true;
 }