keys())

This question already has an answer here:

PHP syntax for dereferencing function result 22 answers

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This will not work on PHP under version 5.5, because they don't know where to hold returned array. You need to implement in this way:

$request = $_REQUEST;
$tmp = array_keys($request);
if (!isset($tmp[0]))
{
    require("ipchecker.php");
    exit();
}

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Because in php 5.2 you can't do:

$var = myfunction()['mykey'];

You have to do:

$tmp = myfunction();
$var = $tmp['mykey'];

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