PHP两次向数据库提交条目

Question

I have a game where you can submit your score to a database, but for some reason the submission keeps getting triggered twice. Every entry is doubled. I've seen similar problems posted here, and the solution had to do with the if/else check at the end, but I don't see a problem.

Is it my PHP code that's duplicating the entries or my game application?

<?php

$servername = "xxx";
$username = "xxx";
$password = "xxx";
$dbname = "xxx";
$port = "xxx";

$link = mysqli_connect($servername, $username, $password, $dbname, $port);


// Security
$playerInitials = mysqli_real_escape_string($link,$_REQUEST['initials']);
$playerEmail = mysqli_real_escape_string($link,$_REQUEST['email']);
$playerScore = mysqli_real_escape_string($link,$_REQUEST['score']);

// Convert Initials to Upper Case
$playerInitialsUC = strtoupper($playerInitials);


$sql = "INSERT INTO xmas (initials, email, score)
VALUES ('$playerInitialsUC', '$playerEmail', '$playerScore')";


if(mysqli_query($link, $sql)){
    echo "Records added successfully.";
} else{
    echo "ERROR: " . mysqli_error($link);
}


mysqli_close($link);

?>

Answer 1

You can try this in your sql query:

REPLACE does exactly what INSERT does but it won't let sql query double a record.

REPLACE into xmas (initials, email, score) values('$playerInitialsUC', '$playerEmail', '$playerScore')

You can tell me if it didn't work or it's not what you want :)

Or you can add this query to the end of your code to make the rows unique:(not sure about this one):

ALTER TABLE xmas ADD UNIQUE( `initials`, `email`, `score`)