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# 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

例 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"; } } ?>`

上例将输出：

    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_digit()

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