PHP - Find if any of the keywords in an array exist in a string

Question

Basically, I have an array of keywords, and a piece of text. I am wondering what would be the best way to find out if any of those keywords are present in the text, bearing in m

Answer 1

Working off eWolf's idea...

foreach($keywords as &$keyword) {
  $keyword = preg_quote($keyword);
}

$regex = "/(". implode('|', $keywords) .")/";

return preg_match($regex, $str);

You don't have to check for boundaries if you don't want to, but if you do just surround the group (the () characters) with \b then it'll match only a given word. And you'll want to make sure all the array's members are preg_quoted, for safety.