ctype函数_PHP ctype_xdigit（）函数与示例

ctype函数

PHP ctype_xdigit()函数 (PHP ctype_xdigit() function)

ctype_xdigit() function is a character type (CType) function in PHP, it is used to check whether a given string contains hexadecimal digits or not.

ctype_xdigit()函数是PHP中的字符类型(CType)函数，用于检查给定的字符串是否包含十六进制数字。

It returns true, if all characters of the given strings are hexadecimal digits – which are 0,1,2,3,4,5,6,7,8,9,0,A,B,C,D,E,F,a,b,c,d,e,f. Else it returns false.

如果给定字符串的所有字符均为十六进制数字(即0、1、2、3、4、5、6、7、8、9、0，A，B，C，D，E，F) ，则返回true ，a，b，c，d，e，f 。否则返回false 。

Syntax:

句法：

    ctype_xdigit(string) : bool

Example:

例：

    Input: "ABCD1209"
Output: true
Input: "9009aaff"
Output: true
Input: "1234"
Output: true
Input: "123G4"
Output: false

PHP code:

PHP代码：

<?php
$str = "ABCD1209";
if(ctype_xdigit($str))
echo ("$str contains all hexadecimal digits.\n");
else
echo ("$str does not contain all hexadecimal digits.\n");
$str = "9009aaff";
if(ctype_xdigit($str))
echo ("$str contains all hexadecimal digits.\n");
else
echo ("$str does not contain all hexadecimal digits.\n");
$str = "1234";
if(ctype_xdigit($str))
echo ("$str contains all hexadecimal digits.\n");
else
echo ("$str does not contain all hexadecimal digits.\n");
$str = "123G4"; //Here, "G" is not an hexadecimal digit
if(ctype_xdigit($str))
echo ("$str contains all hexadecimal digits.\n");
else
echo ("$str does not contain all hexadecimal digits.\n");	
?>

Output

输出量

ABCD1209 contains all hexadecimal digits.
9009aaff contains all hexadecimal digits.
1234 contains all hexadecimal digits.
123G4 does not contain all hexadecimal digits.