PHP: compare substrings

Question

Really quick noob question with php:

I'm trying to create a conditional statement where I can check if a variable partially matches a substring.

More specific in my case:

$cal is the name of a file, I want it so if $cal contains ".cfg" it echos some text.

pseudocode:

<?php if ($cal == "*.cfg")
 {
    echo "Hello ";
 }
?> 

Answer 1

if (strpos($cal, ".cfg") !== false)
{
  echo "some text";
}

EDIT

My proposal for matching exactly "*.cfg":

$cal = "abc.cfgxyz";
$ext = "cfg";

if (strrpos($cal, ".".$ext) === strlen($cal)-strlen($ext)-1)
{
    echo "matched";
}