hi , it's joy i want to learn about error messege in php i mean if we find user already exits on the database then how to display an error messege on same page same page means like displaying another page on the main page like pop up messege.thanks in advance

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You'll need to use Javascript.

To achive this you need to use Ajax.
Please share your database structure and HTML Form you designed for your application so that I can work on this.

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