php - cURL CURLOPT_WRITEFUNCTION 和 tmpfile()

Question

此代码有效：

// Create temp file to write to
$fp_tmp = tmpfile();

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $name);
curl_setopt($ch, CURLOPT_FILE, $fp_tmp);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, false);
curl_setopt($ch, CURLOPT_REFERER, 'https://dl.dropboxusercontent.com');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_HEADER, 0);

$result = curl_exec($ch);
curl_close($ch);

// Write the files
$fp = fopen($orderfile->getFileLocation(), 'w');
stream_copy_to_stream($fp_tmp, $fp);

此代码不会：

// Create temp file to write to
$fp_tmp = tmpfile();

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $name);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, false);
curl_setopt($ch, CURLOPT_REFERER, 'https://dl.dropboxusercontent.com');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($ch, $str) use (&$fp_tmp) {
    $length = fwrite($fp_tmp, $str);
    return $length;
});

$result = curl_exec($ch);
curl_close($ch);

// Write the files
$fp = fopen($orderfile->getFileLocation(), 'w');
stream_copy_to_stream($fp_tmp, $fp);

我假设我不能以这种方式通过“使用”将流传递给函数，因为它无法复制数据。我想我的问题是，如何使用 CURLOPT_WRITEFUNCTION 将 $str 的内容写入 $fp_tmp？

Answer 1

我是个假人，我忘记使用 fseek() 重置指针。

// Create temp file to write to
$fp_tmp = tmpfile();

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $name);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, false);
curl_setopt($ch, CURLOPT_REFERER, 'https://dl.dropboxusercontent.com');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($ch, $str) use (&$fp_tmp) {
    $length = fwrite($fp_tmp, $str);
    return $length;
});

$result = curl_exec($ch);
curl_close($ch);

// Write the files
$fp = fopen($orderfile->getFileLocation(), 'w');
fseek($fp_tmp, 0);
stream_copy_to_stream($fp_tmp, $fp);