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Email validation and username check


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Hi everybody
can someone help me to make an email validtion system in my code, and help me find a way to check if the username is taken, and if possible where i should put the code in, im new in this and i find it very hard  smile.png
Here is my registration site smile.png


if($_GET["Brugernavn"] && $_GET["Email"] && $_GET["Password1"] && $_GET["Password2"] ) //tjekker alle data
	if($_GET["Password1"]==$_GET["Password2"]) //Her tjekker jeg at begge indtastede password er ens
    $conn=  mysql_connect($Server,$Brugernavn)or die(mysql_error());
    mysql_select_db("test",$conn); //Her opretter jeg en forbindelse til databasen
    $sql="insert into Brugere (Brugernavn,Email,Password)values('$_GET[brugernavn]','$_GET[Email]','$_GET[Password1]')"; //Her indsætter jeg de indtastede værdier ind i tabellen i min database
    $result=mysql_query($sql,$conn) or die(mysql_error());		
    echo "<h1>Du er nu blevet registreret</h1>"; //Hvis alt passer kommer teksten "Du er nu osv." frem
    echo "<a href='Startside.php'>Gå til startside</a>"; //Hvis alt passer kommer der et link der sender brugeren til startsiden
	else echo "Passwordende passer ikke sammen, prøv igen"; //Hvis passwordne ikke passer, udskriver jeg teksten "Passwordende passer osv."
else echo"Data er fucked";




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To validate email you can use filter_input()

$email = filter_input(INPUT_GET,'email',FILTER_VALIDATE_EMAIL);

You can check the username by sending a query to the database

mysql_num_rows will return the number of rows containing the username. 


$q = mysql_query("Select * from table where username='$username'");
echo "Username exists";
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