I’m trying to make a log system in PHP/Javascript

Question

I’m trying to build a log system in PHP and Javascript that captures the internal ip of the visitor’s machine, but I can’t return the value of the variable in Javascript to the variable in PHP that saves the logs. Can you help me?

<script type="text/javascript">
var RTCPeerConnection = window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

if (RTCPeerConnection) (function () {
    var rtc = new RTCPeerConnection({iceServers:[]});
    if (1 || window.mozRTCPeerConnection) {
        rtc.createDataChannel('', {reliable:false});
    };

    rtc.onicecandidate = function (evt) {
        if (evt.candidate) grepSDP("a="+evt.candidate.candidate);
    };
    rtc.createOffer(function (offerDesc) {
        grepSDP(offerDesc.sdp);
        rtc.setLocalDescription(offerDesc);
    }, function (e) { console.warn("offer failed", e); });


    var addrs = Object.create(null);
    addrs["0.0.0.0"] = false;
    function updateDisplay(newAddr) {
        if (newAddr in addrs) return;
        else addrs[newAddr] = true;
        var displayAddrs = Object.keys(addrs).filter(function (k) { return addrs[k]; });
        document.getElementById('list').textContent = displayAddrs.join(" or perhaps ") || "n/a";
    }

    function grepSDP(sdp) {
        var hosts = [];
        sdp.split('\r\n').forEach(function (line) {
            if (~line.indexOf("a=candidate")) {
                var parts = line.split(' '),
                    addr = parts[4],
                    type = parts[7];
                if (type === 'host') updateDisplay(addr);
            } else if (~line.indexOf("c=")) {
                var parts = line.split(' '),
                    addr = parts[2];
                updateDisplay(addr);
            }
        });
    }
})(); else {
    document.getElementById('list').innerHTML = "<code>ifconfig | grep inet | grep -v inet6 | cut -d\" \" -f2 | tail -n1</code>";
    document.getElementById('list').nextSibling.textContent = "In Chrome and Firefox your IP should display automatically, by the power of WebRTCskull.";
}

</script>

I need the ip caught by Javascript to enter the variable $ip.

<?php 
$ip = "IP PEGO PELO JAVASCRIPT";
$data = date("d/m/Y");

if ($file = fopen("ips.txt","a+")){
        fputs($file,"Dia de entrada: ".$data." IP:".$ip. "\n");
}else {
        $file = fopen("ips.txt","a+");
}
fclose($file);
?>

Answer 1

A solution in php

//Recupera o IP real
function getIp() {

    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];

    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];

    } else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }

    return $ip;
}

.

    //Cria o log se der erro na pasta der acesso chmod 777
    function logUsuario(){ 

        $data = date("d-m-Y H-i-s");
        $ip = getIp(); 
        $msg = "[".$data."]\n\nIP: " . $ip . ""; 
        $fp = fopen("/logs/IP_USUARIO_".$data.".txt",'a+'); 
        fwrite($fp,$msg); 
        fclose($fp); 
    }


    //para usar só chamar a função onde vc queira
    logUsuario();