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php保存文件的方法

php保存文件的方法:首先创建一个PHP示例文件;然后生成文件;最后用代码“if(isset($_GET["filepath"])) {...}”实现下载保存即可。

本文操作环境:windows7系统、PHP7.1版,DELL G3电脑

php保存文件的方法

PHP 下载保存文件到本地

经常需要点击按钮,然后弹出一个对话框,保存下载文件。

最常见的方式,就用<a>链接实现,例如:

<a href="xxx/youfile.txt"> youfile.txt </a>

本文介绍的下载保存方式,是通过生成文件后,然后用代码实现下载保存。

完整示例(推荐)

<?php
/**
* 下载文件header函数
* copyright by www.mimvp.com
* 2015-05-10
*/
 
$res_filepath = "";
if(isset($_GET["filepath"])) {
    $res_filepath = $_GET["filepath"];
}
 
//  $filepath = "./lib/tmp_txt_result_file_20150508170116.txt";
    $file_realpath = realpath($res_filepath);
    $file_basename = basename($res_filepath);
//  $file_filesize = filesize($res_filepath);
    $file_fileinfo = pathinfo($res_filepath);
 
    if (!file_exists($res_filepath)){
   header("Content-type: text/html; charset=utf-8");
   echo "<html>
 <div style='margin-left: 20px'>
<br>
<font color='blue'>$file_basename</font> 是临时文件已过期,服务器不保存!
<br><br>
请提取最新代理: <a href='fetch.php'>http://proxy.mimvp.com/api/fetch.php</a>
 
<!--
<script>
alert('" . $file_basename . "\\n是临时文件,服务器不保存! \\n\\n请重新提取最新代理');
</script>
-->
 </div>
    </html>";
    } else {
   $file_filesize = filesize($res_filepath);
   $file = fopen($res_filepath, "r");
   Header("Content-type: application/octet-stream");
   Header("Accept-Ranges: bytes");
   Header("Accept-Length: " . $file_filesize);
   Header("Content-Disposition: attachment; filename=" . $file_basename);
   echo fread($file, $file_filesize);
   fclose($file);
// echo file_get_contents($filename);
// readfile($filename);
    }
 
    // 下载或取消后,删除临时文件
    $del_result = @unlink($res_filepath);
    if ($del_result == true) {
   @unlink($res_filepath);
    }
?>

网上其他方式

第一种:

<?php 
    function downfile() {
    $filename=realpath("resume.html"); //文件名
    $date=date("Ymd-H:i:m");
    Header( "Content-type:  application/octet-stream "); 
    Header( "Accept-Ranges:  bytes "); 
    Header( "Accept-Length: " .filesize($filename));
    header( "Content-Disposition:  attachment;  filename= {$date}.doc"); 
    echo file_get_contents($filename);
    readfile($filename); 
    }
    downfile();
?>

<?php 
    function downfile($fileurl) {
    ob_start(); 
    $filename=$fileurl;
    $date=date("Ymd-H:i:m");
    header( "Content-type:  application/octet-stream "); 
    header( "Accept-Ranges:  bytes "); 
    header( "Content-Disposition:  attachment;  filename= {$date}.doc"); 
    $size=readfile($filename); 
    header( "Accept-Length: " .$size);
    }
    $url="url地址";
    downfile($url);
?>

第二种:

<?php 
    function downfile($fileurl) {
   $filename=$fileurl;
   $file  =  fopen($filename, "rb"); 
   Header( "Content-type:  application/octet-stream "); 
   Header( "Accept-Ranges:  bytes "); 
   Header( "Content-Disposition:  attachment;  filename= 4.doc"); 
   $contents = "";
   while (!feof($file)) {
  $contents .= fread($file, 8192);
   }
   echo $contents;
   fclose($file); 
    }
    $url="url地址";
    downfile($url);
?>

PHP实现下载文件的两种方法

方法1:

<?php
    /**
    * 下载文件, header函数实现
    */
 
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($filepath));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0′);
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0′);
    header('Pragma: public');
    header('Content-Length: ' . filesize($filepath));
    readfile($file_path);
?>

了解php中header函数的用法

方法2:

<?php
    //文件下载, readfile实现
    $fileinfo = pathinfo($filename);
    header('Content-type: application/x-'.$fileinfo['extension']);
    header('Content-Disposition: attachment; filename='.$fileinfo['basename']);
    header('Content-Length: '.filesize($filename));
    readfile($thefile);
    exit();
?>

推荐学习:《PHP视频教程》

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