I use this PHP code to get the visitor&#39;s IP address even though they are using a proxy.
Here my code https://txeditor.com/jhplinuspa3
But why return error Use of undefined constant FILTER_VALIDATE - assumed &#39;FILTER_VALIDATE&#39; on line 8 blah blah blah

I use this PHP code to get the visitor's IP address even though they are using a proxy.

Here my code https://txeditor.com/jhplinuspa3

But why return error  Use of undefined constant FILTER\_VALIDATE - assumed 'FILTER\_VALIDATE' on line 8 blah blah blah


Get Real Visitor IP Address

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