(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_cntrl — �������ַ����
$text
) : bool
����ṩ�� string �� text ������ַ��Dz��Ƕ��ǿ����ַ���
�����ַ��������磺���С��������ո�
text��Ҫ�����Ե��ַ�����
����ڵ�ǰ�����Ի����� text �����ÿ���ַ����ǿ����ַ����ͷ��� TRUE ����֮�ͷ��� FALSE ��
Example #1 һ�� ctype_cntrl() ����
<?php
$strings = array('string1' => "\n\r\t", 'string2' => 'arf12');
foreach ($strings as $name => $testcase) {
if (ctype_cntrl($testcase)) {
echo "The string '$name' consists of all control characters.\n";
} else {
echo "The string '$name' does not consist of all control characters.\n";
}
}
?>
�������̻������
The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters.
Note:
�������һ�� -128 �� 255 ֮��(��)������, ���ᱻ����Ϊ��ֵ��Ӧ��ASCII�ַ� (��ֵ������ 256 ��֧����չASCII�ַ�). �����������ᱻ����Ϊ��ֵ��Ӧ��ʮ�����ַ���.