(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_alnum — ����ĸ�������ַ����
text�����ַ�����
���text�����е��ַ�ȫ������ĸ��(����)���֣����� TRUE
����FALSE
Example #1 A ctype_alnum() ʾ�� (ʹ��Ĭ�ϵ���������)
<?php
$strings = array('AbCd1zyZ9', 'foo!#$bar');
foreach ($strings as $testcase) {
if (ctype_alnum($testcase)) {
echo "The string $testcase consists of all letters or digits.\n";
} else {
echo "The string $testcase does not consist of all letters or digits.\n";
}
}
?>
�������̻������
The string AbCd1zyZ9 consists of all letters or digits. The string foo!#$bar does not consist of all letters or digits.
Note:
�������һ�� -128 �� 255 ֮��(��)������, ���ᱻ����Ϊ��ֵ��Ӧ��ASCII�ַ� (��ֵ������ 256 ��֧����չASCII�ַ�). �����������ᱻ����Ϊ��ֵ��Ӧ��ʮ�����ַ���.