(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";
}
}
?>
上例将输出：
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.