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  • PHP函数 ctype_alnum

    //判断是否是字母和数字或字母数字的组合
    if(!ctype_alnum($str)){
        echo '只能是字母或数字的组合';exit;
    }


    整理下ctype functions:

    1.ctype_alnum(string $text)://检查是否是字母或数字或字母数字的 组合
    2.ctype_alpha(string $text):check for alphabetic character(s) //检查字符串是否是字母
    3.ctype_cntrl(string $text):check for control character(s) //是否是控制字符如\n,\r,\t
    4.ctype_digit(strint $text):check for numeric character(s) //是否是数字表示的字符
    
    5.ctype_graph(string $text):Check for any printable character(s) except space //检查是否有任何可打印字符,除了空格(补)
    6.ctype_lower():check for lowercase character(s)//检查是否是小写字母
    7.ctype_upper():check for uppercase character(s)//检查是否是大写字母
    8.ctype_space: check for whitespace character(s)//是否是空白字符
    9.ctype_xdigit: check for character(s) representing a hexadecimal digit//检查是否是十六进制数字


    ctype_digit()  与 is_numeric()  的区别:

    例:
    
    $numeric_string='123';
    $interger = 123;
    ctype_digit($numeric_string);//true
    ctype_digit($interger);//false
    is_numeric($numeric_string); //true
    is_numeric($interger); //true
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  • 原文地址:https://www.cnblogs.com/wenzichiqingwa/p/2671359.html
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