ctype_lower
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_lower — 检测小写字符
参数
返回值
如果在当前区域设置中 text 里的每个字符都是小写字母，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_lower() 示例 (使用默认的语言环境)
<?php
$strings = array('aac123', 'qiutoas', 'QASsdks');
foreach ($strings as $testcase) {
if (ctype_lower($testcase)) {
echo "The string $testcase consists of all lowercase letters.\n";
} else {
echo "The string $testcase does not consist of all lowercase letters.\n";
}
}
?>以上示例会输出：
The string aac123 does not consist of all lowercase letters. The string qiutoas consists of all lowercase letters. The string QASsdks does not consist of all lowercase letters.
参见
- ctype_alpha() - 检测字母字符
- ctype_upper() - 检测大写字符
- setlocale() - 设置区域信息
- IntlChar::islower() - Check if code point is a lowercase letter
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