Learn Infinity | jQuery Signature Pad & Canvas Image
Put signature below,
$result = array();
$imagedata = base64_decode($_POST['img_data']);
$filename = md5(date("dmYhisA"));
//Location to where you want to created sign image
$file_name = './doc_signs/'.$filename.'.png';
file_put_contents($file_name,$imagedata);
$result['status'] = 1;
$result['file_name'] = $file_name;
echo json_encode($result);