I am having problems creating a simple PHP script. The $_GET["give"] variable is always 0 in PHP, but I did define it in the URL. If it's not defined, my script redirects.
if (isset($_GET["give"])&&$_GET["give"]!="") {
echo "give GET detected<br />";
$user = $_GET["give"];
echo $_GET["give"]+$user+"<br />";
}
header("Location: /diamonds/"); //this document, but removing arguments.
The URL is fine, /?give=kroltan, it should echo kroltan. But instead, I get this in the browser:
give GET detected <br>
0
It doesn't even echo the $user variable, although it's the same value as $_GET["give"]. And no <br> after that too
This is PHP. You concat strings with a . and not a +.
As @MarcB said in the comments - in other words, you're doing a mathematical addition on strings, so PHP is converting your kroltan string to a 0.
In PHP, the + operator is for algebraic addition, whereas . is used for string concatenation.
You are using numeric addition (+) operator instead of string concatenation (.) one in $_GET["give"]+$user+"<br />". PHP happily converts non-numeric strings to zeroes.
By using a plus sign PHP thinks it is dealing with numbers and thus changes the string into a number. Which results in an integer with the value zero. Therefor you will always get the value zero back. Due to the values of the strings being zero.
If you want to combine strings you should use the dot instead of a plus sign.
So instead of:
echo $_GET["give"]+$user+"<br />";
You should use
echo $_GET["give"] . $user . "<br />";
Btw the code will always redirect, because you are not using an else statement, also why are you assigning the value of $_GET['give'] to $user and combining them in the next line? That seems odd.