(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_lower — ��Сд�ַ����
text��Ҫ�����Ե��ַ�����
����ڵ�ǰ�����Ի����� text �����ÿ���ַ�����Сд��ĸ���ͷ��� TRUE ����֮�ͷ��� FALSE ��
Example #1 һ�� ctype_lower() ���� (ʹ��Ĭ�ϵ����Ի���)
<?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";
}
}
?>
�������̻������
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:
�������һ�� -128 �� 255 ֮��(��)������, ���ᱻ����Ϊ��ֵ��Ӧ��ASCII�ַ� (��ֵ������ 256 ��֧����չASCII�ַ�). �����������ᱻ����Ϊ��ֵ��Ӧ��ʮ�����ַ���.