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PHP5中文手册

ctype_upper

(PHP 4 >= 4.0.4, PHP 5)

ctype_upper — Check for uppercase character(s)

说明

bool ctype_upper ( string $text )

Checks if all of the characters in the provided string, text , are uppercase characters.

参数

text

The tested string.

返回值

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

范例

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.