php如何对字节流bytes进行加密解密呢？
如下面这段代码，打开文件后输出字节流，那么这个字节流怎么加密和解密？
<?php
$file_name = "demo.mp4";
$file_sub_path = "../video/";
$file_path = $file_sub_path.$file_name;
$fp = fopen($file_path, "r");
$file_size = filesize($file_path);
//下载文件需要用到的头
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length:".$file_size);
Header("Content-Length:".$file_size);
Header("Content-Disposition: attachment; filename=".$file_name);
$buffer = 1024;
$file_count = 0;
while (!feof($fp) && $file_count < $file_size) {
$file_con = fread($fp, $buffer);
$file_count += $buffer;
echo $file_con;//这个数据怎么加密
}
fclose($fp);
?>私活外包
