ctype_upper
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_upper — 检测大写字符
参数
示例
示例 #1 ctype_upper() 示例(使用当前默认语言环境)
<?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";
}
}
?>
以上示例会输出:
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.
参见
- ctype_alpha() - 检测字母字符
- ctype_lower() - 检测小写字符
- setlocale() - 设置区域信息
- IntlChar::isupper() - Check if code point has the general category "Lu" (uppercase letter)
+添加备注
用户贡献的备注 1 note
chris at theothernews dot co dot nz ¶
10 years ago
Underscores in the string will result in false, so you have to remove them first.