Writing the contents of an array to another file?

I'm attempting to test out the PayPal IPN, so I want to set-up a script to write all the contents of the $_GET array to a file, so I can see if what is requested is as I assume.

However, I'm having trouble configuring the file to actually display the contents of the array as though it were being dumped.

For example:

$string = $_GET;

$fp = fopen("paypal_req.txt", "w");
fwrite($fp, $strin开发者_如何学JAVAg);
fclose($fp);

Simply echo's the value of $_GET into the file paypal_req.txt, which of course is Array.

How could I have the contents of the array $_GET dumped into paypal_req.txt as though I were using var_dump()?

Any help would be greatly appreciated!

$string = print_r($_GET, true);

If you want a similar output to var_dump(), you can use the var_export() function:

$string = var_export($_GET, true);

The var_export($_GET, true) suggestion is the best, but you could use var_dump by capturing its output with output buffering.

<?php
ob_start();
var_dump($_GET);
$dump = ob_get_clean();
?>