PHP Notice: Undefined variable in array_walk_recursive function

Question

I have this code for download my files :

$id = '251';
$type = 'download';
$post_type = 'news';
$file_name = 'C_3.docx';

$files = _files_list_($id,$type);

print_r($files);

array_walk_recursive($files, function ($value) {

    if (false !== stripos($value, $file_name)) { // LINE 17
        $file = ABSPATH.'/uploads/files/'. _is_file_author($id,$type,$post_type).'/'.$value.'';
        ( new Downloader( $file ) )->download();
        echo $file;
    }
});

print_r($files) :

Array ( [0] => Array ( [0] => docs/manager.zip ) [1] => Array ( [0] => docs/C_3.docx ) )

But in Action i see this error (not detect $id , $type, $file_name, $post_type):

Notice: Undefined variable: file_name in C:\xampp\htdocs\cmd\modules\download.php on line 17

how do fix this error?

$file_name is out of scope here. You need to use it. So do something like this ..function($value) use ($file_name). And as @DeDee said, it could very well be undefined. But in the context above, it's just out of scope. — Andrei
– Andrei, Commented Aug 31, 2015 at 10:18
Eh, I'm good. Imaginary internet points don't really tickle me right anyway. — Andrei
– Andrei, Commented Aug 31, 2015 at 10:20
@Andrew: error fix, but not detect $id , $type, $file_name, $post_type in array_walk_recursive — Perspolis
– Perspolis, Commented Aug 31, 2015 at 10:27
Makes sure you use all the variables and also make sure they contain some sort of value. — Andrei
– Andrei, Commented Aug 31, 2015 at 10:28

Community · Accepted Answer · 2017-05-23 10:26:34Z

1

@Andrew post good comments and @briosheje send complete comments:

i change

array_walk_recursive($files, function ($value)

to

array_walk_recursive($files, function ($value) use ($file_name, $post_type, $type, $id),

this worked now.

edited May 23, 2017 at 10:26

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answered Aug 31, 2015 at 10:40

Perspolis

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1 Comment

Viral Over a year ago

Also note that, superglobals like $_GET, $_POST, etc... are accessible without passing with use. So, you can directly use them

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