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Opening SQL DB fails


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My server is running PHP version 7.3

I'm getting the error

"Backend fatal error: PHP Fatal error: Uncaught Error: Call to undefined function mysqli()"

on this code to open my DB :

$servername = "localhost";
$username = "tester";
$password = "@Tester@";
$db = "test";
// Create connection
$conn = mysqli_connect($servername, $username, $password,$db);
// Check connection
if (!$conn) {
   die("Connection failed: " . mysqli_connect_error());
}else {
   echo "Connected successfully";

Can someone give me hint on the mistake I'm making ?



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