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【PHP】下载文件
作者:Dezai.CN / 发布于2011/2/10/ 585
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<pre><span class="punct"><</span><span class="char">?p</span><span class="ident">hp</span>

<span class="global">$filename</span> <span class="punct">=</span> <span class="global">$_GET</span><span class="punct">['</span><span class="string">filename</span><span class="punct">'];</span>

<span class="punct">/</span><span class="punct">/</span> <span class="constant">Modify</span> <span class="ident">this</span> <span class="ident">line</span> <span class="ident">to</span> <span class="ident">indicate</span> <span class="ident">the</span> <span class="ident">location</span> <span class="ident">of</span> <span class="ident">the</span> <span class="ident">files</span> <span class="ident">you</span> <span class="ident">want</span> <span class="ident">people</span> <span class="ident">to</span> <span class="ident">be</span> <span class="ident">able</span> <span class="ident">to</span> <span class="ident">download</span>
<span class="punct">/</span><span class="punct">/</span> <span class="constant">This</span> <span class="ident">path</span> <span class="ident">must</span> <span class="keyword">not</span> <span class="ident">contain</span> <span class="ident">a</span> <span class="ident">trailing</span> <span class="ident">slash</span><span class="punct">.</span>  <span class="ident">ie</span><span class="punct">.</span>  <span class="punct">/</span><span class="ident">temp</span><span class="punct">/</span><span class="ident">files</span><span class="punct">/</span><span class="ident">download</span>
<span class="global">$download_path</span> <span class="punct">=</span> <span class="punct">"</span><span class="string">ficheros/</span><span class="punct">";</span>
	
<span class="punct">/</span><span class="punct">/</span> <span class="constant">Make</span> <span class="ident">sure</span> <span class="ident">we</span> <span class="ident">can</span><span class="punct">'</span><span class="string">t download files above the current directory location.
if(eregi("\.\.", $filename)) die("I</span><span class="punct">'</span><span class="ident">m</span> <span class="ident">sorry</span><span class="punct">,</span> <span class="ident">you</span> <span class="ident">may</span> <span class="keyword">not</span> <span class="ident">download</span> <span class="ident">that</span> <span class="ident">file</span><span class="punct">."</span><span class="string">);
$file = str_replace(</span><span class="punct">".."</span><span class="string">, </span><span class="punct">""</span><span class="string">, $filename);
	
// Make sure we can't download .ht control files.
if(eregi(</span><span class="punct">"\.</span><span class="ident">ht</span><span class="punct">.+"</span><span class="string">, $filename)) die(</span><span class="punct">"</span><span class="ident">I</span><span class="punct">'</span><span class="string">m sorry, you may not download that file.");
	
// Combine the download path and the filename to create the full path to the file.
$file = "$download_path$file";
	
// Test to ensure that the file exists.
if(!file_exists($file)) die("I</span><span class="punct">'</span><span class="ident">m</span> <span class="ident">sorry</span><span class="punct">,</span> <span class="ident">the</span> <span class="ident">file</span> <span class="ident">doesn</span><span class="punct">'</span><span class="string">t seem to exist.");
	
// Extract the type of file which will be sent to the browser as a header
$type = filetype($file);

// Get a date and timestamp
$today = date("F j, Y, g:i a");
$time = time();

// Send file headers
header("Content-type: $type");
header("Content-Disposition: attachment;filename=$filename");
header("Content-Transfer-Encoding: binary");
header(</span><span class="punct">'</span><span class="constant">Pragma</span><span class="punct">:</span> <span class="ident">no</span><span class="punct">-</span><span class="ident">cache</span><span class="punct">'</span><span class="string">);
header(</span><span class="punct">'</span><span class="constant">Expires</span><span class="punct">:</span> <span class="number">0</span><span class="punct">'</span><span class="string">);
// Send the file contents.
set_time_limit(0);
readfile($file);

?></span></pre>

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