(PHP 4 >= 4.0.4, PHP 5)
ctype_lower — Check for lowercase character(s)
$text
)
Checks if all of the characters in the provided string,
text, are lowercase letters.
text
The tested string.
Returns TRUE if every character in text is
a lowercase letter in the current locale.
Example #1 A ctype_lower() example (using the default locale)
<?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.