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ctype_upper

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

ctype_upper检测大写字符

说明

ctype_upper(mixed $text): bool

检测提供的 string 类型的 text 里面的所有字符是否都是大写字符。

参数

text

要测试的字符串。

注意:

如果给出一个 -128 到 255 之间(含)的int, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.

警告

自 PHP 8.1.0 起,弃用传递非字符串参数。未来该参数将解释为字符串而不是 ASCII 码点。根据预期行为,应将参数转为字符串或显式调用 chr()

返回值

如果在当前区域设置中 text 里的每个字符都是大写字母,那么就返回 true;否则返回 false。当使用空字符串调用时,结果始终为 false

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

add a note

User Contributed Notes 2 notes

up
9
chris at theothernews dot co dot nz
8 years ago
Underscores in the string will result in false, so you have to remove them first.
up
-18
Anonymous
7 years ago
// after screwing around with function.ctype-upper
// I found this simple solution

if (strtolower($string) != $string)// its so simple!
{
  echo "uppercase letters found in $string";
}

source: http://stackoverflow.com/questions/4426327/how-to-detect-if-string-contains-1-uppercase-letter-in-php
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