ctype_lower

Check for lowercase character(s) (PHP 4 >= 4.0.4, PHP 5)
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

例 384. 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";
   }
}
?>

上例将输出:

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.