How to force file download with PHP

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被撕碎了的回忆 2020-11-21 23:13

I want to require a file to be downloaded upon the user visiting a web page with PHP. I think it has something to do with file_get_contents, but am not sure how

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  • 2020-11-21 23:18

    Display your file first and set its value into url.

    index.php

    <a href="download.php?download='.$row['file'].'" title="Download File">
    

    download.php

    <?php
    /*db connectors*/
    include('dbconfig.php');
    
    /*function to set your files*/
    function output_file($file, $name, $mime_type='')
    {
        if(!is_readable($file)) die('File not found or inaccessible!');
        $size = filesize($file);
        $name = rawurldecode($name);
        $known_mime_types=array(
            "htm" => "text/html",
            "exe" => "application/octet-stream",
            "zip" => "application/zip",
            "doc" => "application/msword",
            "jpg" => "image/jpg",
            "php" => "text/plain",
            "xls" => "application/vnd.ms-excel",
            "ppt" => "application/vnd.ms-powerpoint",
            "gif" => "image/gif",
            "pdf" => "application/pdf",
            "txt" => "text/plain",
            "html"=> "text/html",
            "png" => "image/png",
            "jpeg"=> "image/jpg"
        );
    
        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";
            };
        };
        @ob_end_clean();
        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');
    
        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);
        }
    
        $chunksize = 1*(1024*1024);
        $bytes_send = 0;
        if ($file = fopen($file, 'r'))
        {
            if(isset($_SERVER['HTTP_RANGE']))
            fseek($file, $range);
    
            while(!feof($file) &&
                (!connection_aborted()) &&
                ($bytes_send<$new_length)
            )
            {
                $buffer = fread($file, $chunksize);
                echo($buffer);
                flush();
                $bytes_send += strlen($buffer);
            }
            fclose($file);
        } else
            die('Error - can not open file.');
        die();
    }
    set_time_limit(0);
    
    /*set your folder*/
    $file_path='uploads/'."your file";
    
    /*output must be folder/yourfile*/
    
    output_file($file_path, ''."your file".'', $row['type']);
    
    /*back to index.php while downloading*/
    header('Location:index.php');
    ?>
    
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  • 2020-11-21 23:18

    In case you have to download a file with a size larger than the allowed memory limit (memory_limit ini setting), which would cause the PHP Fatal error: Allowed memory size of 5242880 bytes exhausted error, you can do this:

    // File to download.
    $file = '/path/to/file';
    
    // Maximum size of chunks (in bytes).
    $maxRead = 1 * 1024 * 1024; // 1MB
    
    // Give a nice name to your download.
    $fileName = 'download_file.txt';
    
    // Open a file in read mode.
    $fh = fopen($file, 'r');
    
    // These headers will force download on browser,
    // and set the custom file name for the download, respectively.
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $fileName . '"');
    
    // Run this until we have read the whole file.
    // feof (eof means "end of file") returns `true` when the handler
    // has reached the end of file.
    while (!feof($fh)) {
        // Read and output the next chunk.
        echo fread($fh, $maxRead);
    
        // Flush the output buffer to free memory.
        ob_flush();
    }
    
    // Exit to make sure not to output anything else.
    exit;
    
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  • 2020-11-21 23:18

    try this:

    header('Content-type: audio/mp3'); 
    header('Content-disposition: attachment; 
    filename=“'.$trackname'”');                             
    readfile('folder name /'.$trackname);          
    exit();
    
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  • 2020-11-21 23:20

    http://php.net/manual/en/function.readfile.php

    That's all you need. "Monkey.gif" change to your file name. If you need to download from other server, "monkey.gif" change to "http://www.exsample.com/go.exe"

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  • 2020-11-21 23:21

    Read the docs about built-in PHP function readfile

    $file_url = 'http://www.myremoteserver.com/file.exe';
    header('Content-Type: application/octet-stream');
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"" . basename($file_url) . "\""); 
    readfile($file_url); 
    

    Also make sure to add proper content type based on your file application/zip, application/pdf etc. - but only if you do not want to trigger the save-as dialog.

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  • 2020-11-21 23:21
    <?php
    $file = "http://example.com/go.exe"; 
    
    header("Content-Description: File Transfer"); 
    header("Content-Type: application/octet-stream"); 
    header("Content-Disposition: attachment; filename=\"". basename($file) ."\""); 
    
    readfile ($file);
    exit(); 
    ?>
    

    Or, when the file is not openable with the browser, you can just use the Location header:

    <?php header("Location: http://example.com/go.exe"); ?>
    
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