PHP Simple Function to Get Uploaded Image Width + Height

PHP Simple PHP Function to get the Width and Height of an Uploaded Image

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The following simple PHP function makes it easy to get the image and height of an image after it is uploaded.

/*********************************************************************
$imgfile = THE IMAGE YOU WANT TO GET THE WIDTH AND HEIGHT OF. 
           TYPICALLY YOU WOULD USE $_FILES[$formimgname]['tmp_name']

$$retimgwidth = BY REFERENCE VAR RETURNS WIDTH OF IMAGE [$imgfile]

&$retimgheight = BY REFERENCE VARE RETURNS HEIGHT OF IMAGE [$imgfile]
**********************************************************************/
function image_widtheight($imgfile, &$retimgwidth, &$retimgheight){

// IF IMAGE SIZE CHECK RETURNS FALSE THEN MAY BE HACKER AND IS FAKE IMAGE
   $arrimginfo = getimagesize($imgfile);

if($arrimginfo == false){
         return false;
   }
 
   // IF IMAGE WIDTH = 0 OR IMAGE HEIGHT = 0 MEANS ERROR
   if(($arrimginfo[0] != 0) && ($arrimginfo[1] != 0)){

$retimgwidth   = $arrimginfo[0];
         $retimgheight  = $arrimginfo[1];

}else{// IF ERROR GETTING IMAGE HEIGHT AND WIDTH THEN SAVE
         // EMPTY STRING SO HTML CODE WILL HAVE height='', width=''  
         $retimgwidth   = '';
         $retimgheight  = '';
   }
}

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