Question

I would like to append a string to the values of a nested associative array in PHP.

The following is my array

$styles = array(
    'Screen' => array(
        "master.css",
        "jquery-jvectormap-1.0.css"),
    'handheld' => array("mobile.css") 
     );

Looping over it to change it in the following way fails.

foreach($media as $medium => $filename)
foreach($filenames as &$filename)
    $filename = "/styles/".$filename;

Prefixing $medium with & just causes a syntax error.

This also fails.

function prepend($prefix,$string)
{
return $prefix.$string;
}

foreach($media as &$medium)
  $medium = array_map(prepend("/styles"),$medium); 

What is the simplest way to prefix "/styles/" to those css filenames given this data structure?

Answer 1

Try this:

$styles = array(
    'Screen' => array(
        "master.css",
        "jquery-jvectormap-1.0.css"),
    'handheld' => array("mobile.css") 
     );

foreach($styles as $k=>$v){
    foreach($v as $a=>$b){
        $styles[$k][$a] = '/styles/'.$b;
    }
}

print_r($styles);