How can I display a message dialog box when account is created and then takes me back to login page in PHP

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PHP

When dialog box displays "Account Created", it does not take me back to the login page............i also do not want to use SweetAlert for the dialogbox....I need something easy and different am a beginner though in PHP. THANKS

What I have tried:

echo'
alert("Account Already Exist")
<a href="Login page link/"></a>
';