(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_lower — 检测小写字符
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.