在PHP中接收查询字符串

Question

I am writing code for a simple WAMP server. It would receive a query string from another machine and simply display the parameters after parsing.

How would the server know that a query string has been received? And when received, how would it perform desired action on the query string?

Edit: The parameters are being passed as URL.

Answer 1

You're looking for the superglobal variable $_GET.

For example, at the URL http://example.com/foo.php?bar=BAM, the variable $_GET['bar'] has the value BAM.

You can check whether there are any query string variables by seeing if count($_GET) > 0.

To check whether a parameter is set, you can do something like this:

if (isset($_GET['bar'])) {
    // do something cool
} else {
    echo "Hey, you didn't give me a value for bar!";
}

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Edit: If you are passing it in some other way, not in the URL, then please clarify your question. How you access the data will obviously depend on how you receive it.