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    <p>I'm not sure the answers so far are on point, but it may be me that's confused. I'm responding in particular to the part of your question that says, "not accessible over the Internet". Here's my attempt at an answer:</p> <p>The web server, not PHP, listens on a socket and accepts connections. PHP can get information about the connection from $_SERVER (<a href="http://www.php.net/manual/en/reserved.variables.server.php" rel="noreferrer">http://www.php.net/manual/en/reserved.variables.server.php</a>). Be aware that all you're checking is from whence the connection came - you can't learn anything about whether your server is available via other IP addresses from $_SERVER. For example, I can access my local instance of Apache/PHP via any of:</p> <ul> <li><a href="http://localhost/" rel="noreferrer">http://localhost/</a> ($_SERVER["SERVER_ADDR"] => ::1)</li> <li><a href="http://127.0.0.1/" rel="noreferrer">http://127.0.0.1/</a> ($_SERVER["SERVER_ADDR"] => 127.0.0.1)</li> <li><a href="http://192.168.75.121/" rel="noreferrer">http://192.168.75.121/</a> ($_SERVER["SERVER_ADDR"] => 192.168.75.121)</li> <li><a href="http://shiva.local/" rel="noreferrer">http://shiva.local/</a> ($_SERVER["SERVER_ADDR"] => fe80::21c:42ff:fe00:8)</li> </ul> <p>So, if your plan is that the app is to behave differently upon seeing the "correct" value in $_SERVER["SERVER_ADDR"], you're probably pretty safe - i.e., it's unlikely that could be spoofed by a user from a remote client.</p> <p>Having said all of that, I would not use any of these techniques for either authentication of users or authorization of user privileges/actions on a deployed application that is available over the Internet. The one exception might be if you've got an entire app that is only to be available when accessed from localhost - then this technique probably makes decent sense and will be secure enough for a personal app.</p>
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    1. POHow to detect if running on localhost
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    1. COI'm not worried about securing anything -- the script (WordPress plugin) sends the URL of a file to a web-based API; I'm trying to ensure people aren't trying this from their local, non-net-accessible machines.
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