[PHP] Check if a word is in my string.

[Brandon Orther]

Hello,
 
I have a variable with a string in it.  I want to check if in that
string a certain word is in it.  Example
 
$var = "This is a good sentence";
 
$check = look("good", $var);
 
 
and $check would equal 1 since "good" is in that string
 
 
 
 
does anyone know how to do this?