如何在Codeigniter中调用带有参数的函数以强制下载

Question

I want to call function download when I click the Download Text, but my href always showing php error. I got stuck here and confuse how to do it.

This is my view :

<?php $i=1; foreach($map as $dokumen)
{
?>
    <tr>
    <th scope="row"><?php echo $i?></th>
    <td><?php echo $dokumen?></td>
    <td><?php $path = 'file/dokumenkp/' . $dokumen;?>
    <a href="<?php echo base_url(). 'dokumenkp/downloadfiles' . $path['path']; ?>">Download</a>
    </td>
    </tr>
<?php $i++?>
<?php
}?>

And this is my function in Controller :

public function downloadfiles($path)
{
    force_download($path, NULL);
}

Answer 1

Try Below example And provide full path using getcwd()

public function downloadfiles($path){

            $name = 'YourFileName';
            $path = getcwd().$path;
            $mime = get_mime_by_extension(getcwd().$path);
            header('Pragma: public');     // required
            header('Expires: 0');         // no cache
            header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
            header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ($path)).' GMT');
            header('Cache-Control: private',false);
            header('Content-Type: '.$mime);  // Add the mime type from Code igniter.
            header('Content-Disposition: attachment; filename="'.basename($name).'"');  
            header('Content-Transfer-Encoding: binary');
            header('Content-Length: '.filesize($path)); // provide file size
            header('Connection: close');
            readfile($path); // push it out
            exit();
}

Answer 2

It seems to me there are a couple syntax errors. The main one is in these lines.

<td><?php $path = 'file/dokumenkp/' . $dokumen;?>
<a href="<?php echo base_url(). 'dokumenkp/downloadfiles' . $path['path']; ?>">Download</a>

In the first line, $path is defined and is a string, but in the second line it is treated as an array ie. $path['path'] . That's going to produce an error.

But there is still a problem if, in the second line, $path is used as the string it is, ie

<a href="<?php echo base_url(). 'dokumenkp/downloadfiles' . $path; ?>">Download</a>

The problem is the lack of a directory separator between 'dokumenkp/downloadfiles' and $path .

Here is code that fixes all the issues. It is also refactored a little bit to be, IMHO, a little cleaner. (Note how you can use "pre-incrementing" on the counter $i before it is echoed.)

<?php 
$i=0; 
foreach($map as $dokumen)
{
    $path = 'file/dokumenkp/' . $dokumen;
?>
    <tr>
        <th scope="row"><?php echo ++$i; ?></th>
        <td><?php echo $dokumen; ?></td>
        <td><a href="<?php echo base_url('dokumenkp/downloadfiles/' . $path); ?>">Download</a></td>
    </tr>
    <?php 
} ?>

When you get to the controller method downloadfiles($path) several things have to be accomplished to make $path be what you need.

The first problem is that $path is a string with a series of '/' characters in it. CodeIgniter is going to interpret each item after a slash as another argument to the function. In other words, each slash-separated segment of $path will become another variable. There are a couple of ways to deal with this fact.

This problem would not exist if we sent only the file's name - eg downloadfiles('Pedoman.pdf') - where the path could be prepended to the file name. But that would require that all downloads come from the same folder. Your requirement is for different download source folders so we will have to convert $path back into a useful string.

That's not very hard to do, but the parts of the framework we will use don't really require that any input parameters be defined for the function downloadfiles() . So we won't even though we will still send some.

The next issue is that the force_download() function requires an absolute path (full path from the root of the drive). Assuming that the folder "file" is at the same level as "application" we can use FCPATH as the starting place. ( FCPATH is the full path to the folder where CodeIgniter's index.php is found.)

Here's a version of downloadfiles() that accomplishes all those tasks - and a little more.

public function downloadfiles()
{
    // get the array of the URI segments after the controller/method parts
    $segs = array_slice($this->uri->segments, 2);
    // turn that array into an "absolute path" string 
    $fullpath = FCPATH . implode("/", $segs);

    // add a check to see if that path/file exists
    if( ! file_exists($fullpath)){
        echo "File $fullpath not found";
        return;
    }

    force_download($fullpath, NULL);
}

Let me know how this works.