使用PHP下載多個PDF文件

Question

我想從我的服務器上下載PDF文件，並且我嘗試了幾乎所有可以通過Google找到的腳本，但是我得到的只是錯誤，錯誤，錯誤...可以你幫我？我想一個或兩種格式：
1. <A href="Download?file">Download</A>
2. <A href="Download?id=file">Download</A>

Answer 1

我前一陣子發現這個功能在互聯網上：

<?php 
function output_file($file, $name, $mime_type='') 
{ 
/* 
This function takes a path to a file to output ($file), the filename that the browser will see ($name) and the MIME type of the file ($mime_type, optional). 
*/ 

$size = filesize($file); 
$name = rawurldecode($name); 

/* Figure out the MIME type | Check in array */ 
$known_mime_types=array(
    "pdf" => "application/pdf", 
    "txt" => "text/plain", 
    "html" => "text/html", 
    "htm" => "text/html", 
    "exe" => "application/octet-stream", 
    "zip" => "application/zip", 
    "doc" => "application/msword", 
    "xls" => "application/vnd.ms-excel", 
    "ppt" => "application/vnd.ms-powerpoint", 
    "gif" => "image/gif", 
    "png" => "image/png", 
    "jpeg"=> "image/jpg", 
    "jpg" => "image/jpg", 
    "php" => "text/plain" 
); 

if($mime_type==''){ 
    $file_extension = strtolower(substr(strrchr($file,"."),1)); 
    if(array_key_exists($file_extension, $known_mime_types)){ 
     $mime_type=$known_mime_types[$file_extension]; 
    } else { 
     $mime_type="application/force-download"; 
    }; 
}; 

//turn off output buffering to decrease cpu usage 
@ob_end_clean(); 

// required for IE, otherwise Content-Disposition may be ignored 
if(ini_get('zlib.output_compression')) 
    ini_set('zlib.output_compression', 'Off'); 

header('Content-Type: ' . $mime_type); 
header('Content-Disposition: attachment; filename="'.$name.'"'); 
header("Content-Transfer-Encoding: binary"); 
header('Accept-Ranges: bytes'); 

/* The three lines below basically make the 
    download non-cacheable */ 
header("Cache-control: private"); 
header('Pragma: private'); 
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); 

// multipart-download and download resuming support 
if(isset($_SERVER['HTTP_RANGE'])) 
{ 
    list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2); 
    list($range) = explode(",",$range,2); 
    list($range, $range_end) = explode("-", $range); 
    $range=intval($range); 
    if(!$range_end) { 
     $range_end=$size-1; 
    } else { 
     $range_end=intval($range_end); 
    } 

    $new_length = $range_end-$range+1; 
    header("HTTP/1.1 206 Partial Content"); 
    header("Content-Length: $new_length"); 
    header("Content-Range: bytes $range-$range_end/$size"); 
} else { 
    $new_length=$size; 
    header("Content-Length: ".$size); 
} 

/* Will output the file itself */ 
$chunksize = 1*(1024*1024); //you may want to change this 
$bytes_send = 0; 
if ($file = fopen($file, 'r')) 
{ 
    if(isset($_SERVER['HTTP_RANGE'])) 
    fseek($file, $range); 

    while(!feof($file) && 
     (!connection_aborted()) && 
     ($bytes_send<$new_length) 
     ) 
    { 
     $buffer = fread($file, $chunksize); 
     print($buffer); //echo($buffer); // can also possible 
     flush(); 
     $bytes_send += strlen($buffer); 
    } 
fclose($file); 
} else 
//If no permissiion 
die('Error - can not open file.'); 
//die 
die(); 
} 
?> 

使用它是這樣的： OUTPUT_FILE（$文件名，$ newFilename）;

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