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# 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

例子 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.

## 参见

ctype_alpha()
ctype_lower()
setlocale()

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