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PHP文件下载的小实例

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Release: 2016-05-25 16:52:37
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这个文件下载实例做得非常的详细他是结合header函数与while fread函数把文件分断读出来然后再发送到客户端了,算得上一个标准的文件下载实例。

一个PHP文件下载的小实例

/*======================================================
$FileName 为文件名称,必传
$FilePath 为文件路径.选填,可以为相对路径或者绝对路径
  路径只能由英文跟数据组成,不能带有中文
如有问题 欢迎联系博主指出
======================================================*/
<?php
header("Content-type: text/html;charset=utf-8");
if (strlen($FileName) <= 3) {
    echo "下载失败:你所以下载的文件信息有误";
    return;
}
$FileName = iconv("utf-8", "gb2312", $FileName); //进行文件名格式转换,以防中文乱码
//开始判断路径
if (!is_null($FilePath) && strlen($FilePath) > 1) {
    if (substr($FilePath, 0, 1) == &#39;/&#39;) { //判断是否为绝对路径
        $FilePath = $_SERVER[&#39;DOCUMENT_ROOT&#39;] . $FilePath;
    }
    if (substr($FilePath, -1) != "/") { //检查最后是否为 / 结尾
        $FilePath = $FilePath . &#39;/&#39;;
    }
    if (is_numeric(strpos($FilePath, ":"))) { //检查是否为绝对路径
        $FilePath = str_replace("/", "", $FilePath);
    }
} elseif (strlen($FilePath) == 1 && $FilePath != "/") {
    $FilePath = $FilePath . "/";
} else {
    $FilePath = "";
}
if (!file_exists($FilePath . $FileName)) {
    echo "下载失败:所要下载的文件未找到";
    return;
}
/*================================================
   发送下载相关的头部信息
  =================================================*/
header("Content-type: application/octet-stream");
header("Accept-Ranges: bytes"); //按照字节大小返回
header("Accept-Length: $FileSize"); //返回文件大小
header("Content-Disposition: attachment; filename=" . $FileName); //这里客户端的弹出对话框,对应的文件名
/*================================================
   开始下载相关
  =================================================*/
$FileSize = filesize($FilePath . $FileName);
$File = fopen($FilePath . $FileName, "r"); //打开文件
$FileBuff = 512;
while ($FileSize >= 0) {
    $FileSize-= $FileBuff;
    echo fread($File, $FileBuff);
}
fclose($File);
?>
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总结

本下载实例并且支持中文文名了,在文件开头就进行了uft8编码转换了。


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