Check if a String is ALL CAPS in PHP

Question

What\'s the best way to see if a string contains all capital letters? I still want the function to return true if the string also contains symbols or numbers.

Answer 1

If you want numbers included (and by "symbols" most everything else), then what you are actually trying to test for is the absence of lowercase letters:

 $all_upper = !preg_match("/[a-z]/", $string)