How to get the previous url using PHP

$_SERVER['HTTP_REFERER']

javascript check radio buttons automatically

<input id="material_0" type="radio" name="material" value="30" >
<input id="material_1" type="radio" name="material" value="30" >



for (i=0; i<document.getElementsByTagName('input').length; i++)
 {
//if (document.getElementsByTagName('input')[i].type == 'radio')
var k=0;
var matId='material_'+i;

//document.getElementsByTagName('input')[i].id
                        //document.getElementsByTagName('input')[i].valau
if(document.getElementsByTagName('input')[i].name=='material')
{
var resetRadio=document.getElementsByTagName('input')[i].id;

document.getElementById(resetRadio).checked=false;

}
}

get svg image size

$mediapath = ".svg image path";

$file = fopen($mediapath,"r");

if($exten=='svg'){
$content = fread($file,filesize($mediapath));
//fclose($file);
$temp = simplexml_load_string($content);
$width1 = str_replace('px','',(string)$temp->attributes()->width);
$height1 = str_replace('px','',(string)$temp->attributes()->height);
}else{
 $size = getimagesize($mediapath);
}