ctype函数_PHP ctype_alpha（）函数与示例-蒲公英云

ctype函数_PHP ctype_alpha（）函数与示例

清疚 2023-03-05 15:49 66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.