Find extension of file in Php

In our scripting sometimes we need to upload such documents , at that time there should be a validation for proper file.

For example in your system suppose there is a field for image upload , that is obvious in that field only image formats are allowed (jpg,jpeg,png,gif etc.). At that time you have to give a validation on that field.

In Php to find the extension and validation here is your code : 

<?php
      
             $image = $_FILES["file"]["name"];    // to fetch the file name

            $n1=strripos($image,".");                     // to find the last position of "."

            $v1 =substr($image,$n1);                     //  get the rest thing from last "."

            $v1 = strtolower($v1);                          //  convert into lowercase



            if(($v1=='.jpg') || ($v1=='.png') || ($v1=='.jpeg') || ($v1=='.gif')  ){}
            else {    

                          your message goes here

               }

?>

enjoy.....