A quick tip for only allowing access to a website for a range of IP addresses.
This is a very simply and useful way of allowing access to only certain IP addresses maybe you have a web application that you only want to be accessed from a certain location, then this solution is perfect for that task.
First create an array of IP addresses that you want to allow, make sure the last item does not have a ending comma.
$allowlist = array(
'36.285.23.23',
'12.101.67.56',
'98.465.23.89',
'16.289.90.10',
'71.214.228.18'
);
Next check if the users IP address is in the allowed list, if its not stop the script and print a message using the die command.
The users IP address can be accessed from a global function called $_SERVER['REMOTE_ADDR'].
To check use a function called in_array that expect 2 parameters the first is the item to look for and the section is the array, this returns true if there is a march so using the not operator ! before using in_array says if its not in the array
if(!in_array($_SERVER['REMOTE_ADDR'],$allowlist)){
die('This website cannot be accessed from your location.');
}
//collection of allowed IP addresses
$allowlist = array(
'36.285.23.23',
'12.101.67.56',
'98.465.23.89',
'16.289.90.10',
'71.214.228.18'
);
//if users IP is not in allowed list kill the script
if(!in_array($_SERVER['REMOTE_ADDR'],$allowlist)){
die('This website cannot be accessed from your location.');
}
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