ctype函数_PHP ctype_alpha（）函数与示例

清疚 2023-03-05 15:49 8阅读 0赞

ctype函数

## PHP ctype\_alpha()函数 **(**PHP ctype\_alpha() function**)** ##

**ctype\_alpha() function** is a character type (CType) function in PHP, it is used to check whether a given string contains only alphabets or not.

**ctype\_alpha()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仅包含字母。

It returns true – if the string contains only alphabets, else it returns false.

它返回true -如果字符串只包含字母，否则返回FALSE。

**Syntax:**

**句法：**

ctype_alpha(string) : bool

**Example:**

**例：**

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

**PHP code:**

**PHP代码：**

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

**Output**

**输出量**

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

> 翻译自: [https://www.includehelp.com/php/ctype\_alpha-function-with-example.aspx][https_www.includehelp.com_php_ctype_alpha-function-with-example.aspx]

ctype函数

[https_www.includehelp.com_php_ctype_alpha-function-with-example.aspx]: https://www.includehelp.com/php/ctype_alpha-function-with-example.aspx