php - "_" character and variable conflict in filename, save an image -


what i'm trying save few images (3) using function:

function save($filename, $image_type = imagetype_png, $compression = 7, $permissions = null){   if($image_type == imagetype_jpeg)     imagejpeg($this->image, $filename, $compression);   else if($image_type == imagetype_gif)     imagegif($this->image, $filename);   else if($image_type == imagetype_png)     imagepng($this->image, $filename);   if($permissions != null)     chmod($filename, $permissions); }

but when save images under names images/".$user_id."_32x32.png, images/".$user_id."_64x64.png , images/".$user_id."_128x128.png 1 of them saved

i tried change "images/".$user_id.".32x32.png" instead of images/".$user_id."_32x32.png got saved

if save 1 of them images/".$user_id."_32x32.png doesn't save, it's character "_" problem? why?

ps. $user_id integer

edit
tried without var images/_32x32.png, saved 3 images... code here: http://pastebin.com/35wasb0h

try

"images/{$user_id}_32x32.png"

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