function for finding one character in a string?

I have been looking around in the PHP function listing for a function that can find or match one character from a string. I thought it would be something like post_str() or something but never found anything close to that. I get the idea of post and str from the SQL command. I did check the ereg() but it is so confusing, no clear instruction on it. --clip-- $str = ""; $str = "X"; $str = "XY" $str = "Y"; $str = "YX"; --clip-- Those same variables from above, I only need to know if hte "X" exist in the string, nothing else. Thanks, FletchSOD