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.
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