How to use strpos to determine if a string exists in input string?

Question

$filename = \'my_upgrade(1).zip\';
$match = \'my_upgrade\';

if(!strpos($filename, $match))
    {
    die();
    }
else 
   {
   //proceed
   }

In

Answer 1

The strpos() function is case-sensitive.

if(strpos($filename, $match) !== false)
        {
        // $match is present in $filename
        }
    else 
       {
       // $match is not present in $filename 
       }

For using case-insensitive. use stripos() that is it finds the position of the first occurrence of a string inside another string (case-insensitive)