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php 随机生成数字字母组合的方法

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Release: 2018-09-27 16:41:34
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直接上代码:

function getRandomString($len, $chars=null)  
{  
    if (is_null($chars)) {  
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";  
    }  
    mt_srand(10000000*(double)microtime());  
    for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i++) {  
        $str .= $chars[mt_rand(0, $lc)];  
    }  
    return $str;  
}
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例如随机生成 6 位 字母和数字组合 

只需调用函数 并传参6即可。

echo getRandomString(6);
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如果仅仅是生成小写字母你可以使用类似方法

echo chr(mt_rand(65, 90);
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大写字母

echo chr(mt_rand(97, 122));
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