How should I call this function? PHP [duplicate] - php

Question

This question already has answers here:
"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP
(29 answers)
Closed 7 years ago.
How should I call this function? I'm new to PHP. Here's my code... but I have an error
Notice: Undefined variable: ip in C:\xampp\htdocs\PHPTest\ip.php on line 19
<?php
function getRealIpAddr(){
if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}
call_user_func('getRealIpAddr', '$ip');
echo $ip;
?>
UPDATE
Strange reason, I'm using Windows 10, localhost, xampp and google Chrome this script doesn't provide me an ip address! That's why a corrected code was empty... Thought it was some kind of errors or something
Second UPDATE
If you're getting no ip like me, you may try this solution on httpd.conf

Answer 1

Your function returns the IP address, so assign a variable to the return value of the function, like so:
$ip = getRealIpAddr();

Answer 2

Error is very clear $ip is not defined:
Modified Code:
<?
function getRealIpAddr(){
if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
return $ip;
}
$ip = getRealIpAddr(); // your function
echo $ip;
?>
If you want to use $ip variable that you defined inside the function than note that scope of the $ip is limited into the function.
You can not call this variable outside the function. for this you need to store it in a variable as like above mentioned example ($ip = getRealIpAddr();).

Answer 3

You can't access to a variable declared inside a function, but with the return statement you can do :
echo getRealIpAddr();
Instead of :
call_user_func('getRealIpAddr', '$ip');
echo $ip;