Ajax + php verification username repeated code example _ PHP Tutorial

Use ajax + php to verify duplicate code instances. This tutorial uses ajaxphp to send a request to the php program after the user enters the user name, and then query the data, determine whether the user name to be registered has been registered or exists. this tutorial uses ajax php to send a request to the php program after the user enters the user name, and then query the data, check whether the user name to be registered has already been registered or already exists, and return prompt information in a timely manner, so that the user cannot be registered after entering a large table filling form, this is not a good experience. This tutorial is dedicated to solving this problem. it can quickly tell you whether the user name you want to register can be registered.

The ajax + php Tutorial verifies the repeated code instance of the user name

/*
This tutorial uses ajax php to send a request to the php program after the user enters the user name, and then query the data, check whether the user name to be registered has already been registered or already exists, and return prompt information in a timely manner, so that the user cannot be registered after entering a large table filling form, this is not a good experience. This tutorial is dedicated to solving this problem. it can quickly tell you whether the user name you want to register can be registered.
*/
?>




Example of duplicate code for username verification using ajax + php