Ctype 函数
PHP Manual

ctype_xdigit

(PHP 4 >= 4.0.4, PHP 5)

ctype_xdigit Check for character(s) representing a hexadecimal digit

说明

bool ctype_xdigit ( string $text )

Checks if all of the characters in the provided string, text, are hexadecimal 'digits'.

参数

text

The tested string.

返回值

Returns TRUE if every character in text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.

范例

Example #1 A ctype_xdigit() example

<?php
$strings 
= array('AB10BC99''AR1012''ab12bc99');
foreach (
$strings as $testcase) {
    if (
ctype_xdigit($testcase)) {
        echo 
"The string $testcase consists of all hexadecimal digits.\n";
    } else {
        echo 
"The string $testcase does not consist of all hexadecimal digits.\n";
    }
}
?>

以上例程会输出:

The string AB10BC99 consists of all hexadecimal digits.
The string AR1012 does not consist of all hexadecimal digits.
The string ab12bc99 consists of all hexadecimal digits.

参见


Ctype 函数
PHP Manual