PHP中字符串中的粗体匹配文本

Question

I use the following code for replacing matched words within a String:

for ($i=0; $i < count($terms); $i++) {
    if ( $terms[$i] == '' || $terms[$i] == ' ' || strlen($terms[$i])==0 ) continue;
        $searchingFor     = "/" . $terms[$i] . "/i";
        $replacePattern   = "<strong>$0</strong>";
        $result['titulo'] = preg_replace($searchingFor, $replacePattern, $result['title']);
}
echo $result['title']; 

Where 'terms' is an Array from $_GET['terms'].

All works fine except when user input strings containing characters like slashes. It arise an exception in preg_replace.

How can i solve this issue?

Thanks.

Answer 1

Use preg_quote:

$searchingFor     = "/" . preg_quote($terms[$i], "/") . "/i";

This function puts a backslash \ before all characters used in preg syntax (. \ + * ? [ ^ ] $ ( ) { } = ! < > | : -) and also before all characters in the second argument, used here to escape your delimiter character /.