PHP 手册
后退 |  | 前进

# 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

例子 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()

后退 | 起点 | 前进
ctype_upper | 上一级 | Classes/Objects 类／对象函数