Mysql-php randomly comes up with a combination of numbers and letters that loops into the database and then determines what to do if the database exists and then loops back into the database.

PHP a random code, according to the ID inserted into the database, and then determine if the database already exists in the random code and then randomly inserted into the database

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PHP a random code, according to the ID inserted into the database, and then determine if the database already exists in the random code and then randomly inserted into the database

while (true) {    // 生成随机数    // 判断数据库中是否存在    if ($noFount) { // 如果不存在        // 插入数据库        break;    }}

The field defines a unique key, inserts it using a transaction loop, inserts a successful commit, and jumps out of the loop.

1. You first find out all the contents of the DB.
2. In_array again () until false
3. Inserting data

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