Create acronym from a string containing only words

Question

I'm looking for a way that I can extract the first letter of each word from an input field and place it into a variable.

Example: if the input field is "Stack-Overflow Questions Tags Users" then the output for the variable should be something like "SOQTU"

Answer 1

Something like:

$s = 'Stack-Overflow Questions Tags Users';

if(preg_match_all('/\b(\w)/',strtoupper($s),$m)) {
    $v = implode('',$m[1]); // $v is now SOQTU
}

I'm using the regex \b(\w) to match the word-char immediately following the word boundary.

EDIT: To ensure all your Acronym char are uppercase, you can use strtoupper as shown.