PHP：比较两组数字，没有欺骗
我正在为我的网站创建一个彩票竞赛，我需要知道比较数字的最简单方法，以便没有两个人可以选择相同的数字。它是7组数字，每个数字都是1到30之间的数字。
例如，如果用户1选择：1,7,9,17,22,25,29，我如何确保用户2不能选择这些相同的确切数字？
我正在考虑将所有 7 个数字放入一个数组中，对它进行排序，使数字按顺序排列，然后将它们连接成一个字符串。然后，当另一个用户选择他们的 7 个号码时，它会执行相同的操作，然后比较两个号码。有更好的方法吗？
I'm creating a lottery contest for my site, and I need to know the easiest way to compare numbers, so that no two people can choose the same numbers. It's 7 sets of numbers, each number is a number between 1 and 30.
For example, if user 1 chooses: 1, 7, 9, 17, 22, 25, 29 how can I make sure that user 2 can't choose those same exact number?
I was thinking about throwing all 7 numbers into an array, sort it so the numbers are in order, then join them into one string. Then when another user chooses their 7 numbers, it does the same, then compares the two. Is there a better way of doing it?
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你所描述的听起来对我来说是最好的方式，如果你正在同一个脚本中处理所有提交 - 我会
trim(implode(',',$array))排序后的数组，将结果字符串存储在数组中，并调用 in_array() 来确定该值是否已存在。但是我怀疑您实际上正在做的是将选择存储在数据库表中，并将以后的提交与该表进行比较。在这种情况下（我冒昧地假设这里使用 MySQL，但我想说它是 PHP 最常用的引擎）您应该创建一个包含 7 列
choice_1、choice_2 ...choice_7（以及您想要的任何其他列）并在所有七个choice_*列中创建唯一索引。这意味着当您尝试插入重复行时，查询将失败。这让 MySQL 为您完成所有工作。What you describe sounds like the best way to me, IF you are dealing with all submissions in the same script - I would
trim(implode(',',$array))the sorted array, store the resulting string in an array and callin_array()to determine whether the value already exists.HOWEVER I suspect that what you are actually doing is storing the selections in a database table and comparing later submissions against this table. In this case (I am taking a liberty and assuming MySQL here but I would say it is the most common engine used with PHP) you should create a table with 7 columns
choice_1,choice_2...choice_7(along with whatever other columns you want) and create a unique index across all sevenchoice_*columns. This means that when you try and insert a duplicate row, the query will fail. This lets MySQL do all the work for you.尝试 array_diff。 php.net 上有一些非常好的示例。
Try array_diff. There are some really good examples on php.net.