Checks if all of the characters in the provided string,
text, are uppercase characters.
Parameters
text
The tested string.
Return Values
Returns TRUE if every character in text is
an uppercase letter in the current locale.
Examples
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"; } } ?>
The above 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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