ctype_alnum

PHP ctype_alnum()函数 (PHP ctype_alnum() function)

ctype_alnum() function is a character type (CType) function in PHP, it is used to check whether a given string contains alphanumeric characters or not.

ctype_alnum()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字母数字字符。

It returns true – if the string contains alphanumeric value (i.e. alphabets, digits/number only), else it returns false.

它返回true -如果字符串包含字母数字值(即字母，数字只/数字)，否则返回FALSE。

Syntax:

句法：

    ctype_alnum(string) : bool

Example:

例：

    Input: "Hello123"
    Output: true
    Input: "Hello world"
    Output: false
    Input: "[email protected]&a"
    Output: false

PHP code:

PHP代码：

    $str = "Hello123";
    if(ctype_alnum($str))
        echo ("$str contains only alphanumeric characters.\n");
    else
        echo ("$str does not contain only alphanumeric characters.\n");
 
    $str = "Hello world";
    if(ctype_alnum($str))
        echo ("$str contains only alphanumeric characters.\n");
    else
        echo ("$str does not contain only alphanumeric characters.\n");
 
    $str = "[email protected]&a";
    if(ctype_alnum($str))
        echo ("$str contains only alphanumeric characters.\n");
    else
        echo ("$str does not contain only alphanumeric characters.\n");
?>

Output

输出量

Hello123 contains only alphanumeric characters.
Hello world does not contain only alphanumeric characters.
[email protected]&a does not contain only alphanumeric characters.

翻译自: https://www.includehelp.com/php/ctype_alnum-function-with-example.aspx

ctype_alnum