Find - in a word

[xionhack]

Hello. I want to make a function that will store a string in a variable. If there is a dash (-) in the string, it will set the variable to NULL, if it has no dashes then it will store that string in the variable. How can i do that? Thanks!

[premiso]

strstr

 

$string = "test-dash";
if (strstr($string, "-") !== false) {
    $string = null;
}