fpassthru -输出所有剩余的数据文件指针
fpassthru
（ PHP 4中， PHP 5中）
fpassthru -输出所有剩余的数据文件指针
描述
国际fpassthru （资源$处理）
读取EOF分析的特定文件指针从当前的位置和结果写入到输出缓冲区。
您可能需要请倒带（ ）重置文件指针的开头的文件如果您已经写入数据文件。
如果您只想转储文件内容的输出缓冲区，而不首先修改或寻求特定抵消，您可能会想要使用readfile （ ） ，从而节省您fopen （ ）函数的调用。
参数
把柄
文件指针必须有效，必须指向一个文件成功打开fopen （ ）或者fsockopen （ ） （和尚未关闭fclose （ ） ） 。
返回值
如果出现错误， fpassthru （ ）返回FALSE 。否则， fpassthru （ ）返回的字符数读取处理和通过输出。
实例
例如＃ 1使用fpassthru （ ）与二进制文件
// open the file in a binary mode
$name = './img/ok.png';
$fp = fopen($name, 'rb');
// send the right headers
header("Content-Type: image/png");
header("Content-Length: " . filesize($name));
// dump the picture and stop the script
fpassthru($fp);
exit;
?>
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