Ctype 函数
PHP Manual

ctype_lower

(PHP 4 >= 4.0.4, PHP 5)

ctype_lowerCheck for lowercase character(s)

说明

bool ctype_lower ( string $text )

Checks if all of the characters in the provided string, text, are lowercase letters.

参数

text

The tested string.

返回值

Returns TRUE if every character in text is a lowercase letter in the current locale.

范例

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.

参见


Ctype 函数
PHP Manual