<?php
$conn = mysqli_connect("/*IP ADRESS OF LOCALHOST*/", "/*DATABASE NAAM*/", "/*DATABASE WACHTWOORD*/", "/*DATABASE NAAM*/");

if(!$conn){
    die("Connection failed: ".mysqli_connect_error);
}

$ip_address = $_SERVER['REMOTE_ADDR'];
$sql = "INSERT INTO /*TABEL NAAM*/ (/*RIJ NAAM*/) VALUES ('$ip_address')";

if(mysqli_query($conn, $sql)){
    echo "Records inserted successfully.";
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($conn);
}

$conn->close();

echo $_SERVER['REMOTE_ADDR'];
?>