PHP，生成带格式的字符串，检查SQL db？


PHP, generate string with format, check against SQL db?

我试图用PHP作为一种在网页中处理的方法，我的典型语言是Java，所以我不熟悉这将如何对产品密钥进行处理。

这基本上是一个过程：

1
2
3
1. Generate random string with format XX-XXXX-XXXX-XXX a mix of numbers and letters.
2. Check if it already exists in an SQL database
3. If exists, generate another one and repeat?

那么，我如何使用PHP来实现这一点呢？请解释一下我需要做什么，最好的方法是什么。

相关讨论

从以下函数生成随机字符串。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
<?php
function randomString() {
    $alphabet ="abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789";
    $pass = array(); //remember to declare $pass as an array
    $alphaLength = strlen($alphabet) - 1; //put the length -1 in cache
    $array_lengths = array(2,4,4,3);
    foreach($array_lengths as $v){
      for ($i = 0; $i < $v; $i++) {
        $n = rand(0, $alphaLength);
        $pass[] = $alphabet[$n];
      }
      $pass[] = '-';
    }
    return rtrim(implode($pass),'-'); //turn the array into a string
}

echo randomString();

?>

号

SQL请创建唯一的key字段，并使用ON DUPLICATE KEY查询插入/更新数据

演示

相关讨论

您可以使用这种方式生成随机数键。

1
2
3
4
5
echo rk(2)."-".rk(4)."-".rk(4)."-".rk(3);
function rk($chars) {
   $letters = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
   return substr(str_shuffle($letters), 0, $chars);
}
相关讨论

这是一个可能有用的过程！

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
<?php
/** The function below was taken from http://stackoverflow.com/questions/853813/how-to-create-a-random-string-using-php **/
function randString($length, $charset='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'){
    $str = '';
    $count = strlen($charset);
    while ($length--) {
        $str .= $charset[mt_rand(0, $count-1)];
    }
    return $str;
}
/** The function that will do your work is: **/
function theProcess(){
/** Now to inefficiently concatenate your random string together. **/
    $theString = randString(2)."-".randString(4)."-".randString(4)."-".randString(3);
    echo $theString;
/** Proceed to query your database using MySQLi or PDO, with a query similar to: **/
    /** Add your preliminary (connection) code here. **/
    $sthandler = $dbhandler->prepare('SELECT 1 FROM products WHERE productKey = ?');
    $sthandler->execute(array($theString));
/** Check whether a result is returned from MySQL. **/
    if ($sthandler->rowCount() > 0) {
        exit("IT EXISTS!");
    } else {
        theProcess();
    }
}
/** Call the function the first time. **/
theProcess();
?>