(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_lower — 做小写字符检测
text
需要被测试的字符串。
如果在当前的语言环境下 text
里面的每个字符都是小写字母,就返回 TRUE
;反之就返回 FALSE
。
Example #1 一个 ctype_lower() 例子 (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";
}
}
?>
以上例程会输出:
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.
Note:
如果给出一个 -128 到 255 之间(含)的整数, 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.