ctype_upper

Description

Returns TRUE if every character in text is an uppercase letter in the current locale.

Example 1. A ctype_upper() example (using the default locale) <?php $strings = array('AKLWC139', 'LMNSDO', 'akwSKWsm'); foreach ($strings as $testcase) {     if (ctype_upper($testcase)) {         echo "The string $testcase consists of all uppercase letters.\n";     } else {         echo "The string $testcase does not consist of all uppercase letters.\n";     } } ?> This example will output : The string AKLWC139 does not consist of all uppercase letters. The string LMNSDO consists of all uppercase letters. The string akwSKWsm does not consist of all uppercase letters.

See also ctype_alpha(), ctype_lower(), and setlocale().