PHP function store elements in an array -


i'm using front end javascript text editor, submits data in html format, convert images base64 encoded format.

the following function parse $_post super global, html content , store encoded images in images folder along appropriate extension.

$html = preg_replace_callback("/src=\"data:([^\"]+)\"/", function ($matches) {     list($contenttype, $enccontent) = explode(';', $matches[1]);     if (substr($enccontent, 0, 6) != 'base64') {         return $matches[0];     }     $imgbase64 = substr($enccontent, 6);     $imgfilename = md5($imgbase64); // unique filename     $imgext = '';     switch($contenttype) {         case 'image/jpeg':  $imgext = 'jpg'; break;         case 'image/gif':   $imgext = 'gif'; break;         case 'image/png':   $imgext = 'png'; break;         default:            return $matches[0];      }     // here i'm able echo image names thier extentions.    echo $imgfilename . '.' . $imgext;      $imgpath = 'zendesk-images/'.$imgfilename.'.'.$imgext;     // save file disk if doesn't exist     if (!file_exists($imgpath)) {         $imgdecoded = base64_decode($imgbase64);         $fp = fopen($imgpath, 'w');         if (!$fp) {             return $matches[0];         }         fwrite($fp, $imgdecoded);         fclose($fp);     }     return 'src="'.$imgpath.'"'; }, $html);

i'm able echo image names in following line 

echo $imgfilename . '.' . $imgext;

i'm trying store converted images file names in array, haven't been successful in doing that.

here have tried, initialize array before function

$images = array();

then instead of echoing, have tried following. 

$images[] = $imgfilename . '.' . $imgext;

but didn't work, , end empty array

if want use $images in outer scope need like

$images = array(); $html = preg_replace_callback("/src=\"data:([^\"]+)\"/", function ($matches) use(&$images) {     //...     $images[] = $imgfilename . '.' . $imgext;     //... } echo implode(', ', $images);

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