(PHP 4 >= 4.0.4, PHP 5)
ctype_upper — Check for uppercase character(s)
Checks if all of the characters in the provided string, text, are uppercase characters.
The tested string.
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";
}
}
?>
以上例程会输出：
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.