gistfile1.txt

<?php

// from http://www.highonphp.com/regex-pattern-parsing-ifconfig

$data = <<<EOF
eth0      Link encap:Ethernet  HWaddr 00:50:56:33:B6:D2  
          inet addr:192.168.12.103  Bcast:192.168.12.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1337 errors:0 dropped:0 overruns:0 frame:0
          TX packets:985 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1657887 (1.5 MiB)  TX bytes:104418 (101.9 KiB)

ra0      Link encap:Ethernet  HWaddr 00:50:56:33:B6:D3  
          inet addr:192.168.12.103  Bcast:192.168.12.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1337 errors:0 dropped:0 overruns:0 frame:0
          TX packets:985 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1657887 (1.5 MiB)  TX bytes:104418 (101.9 KiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:291 errors:0 dropped:0 overruns:0 frame:0
          TX packets:291 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1243639 (1.1 MiB)  TX bytes:1243639 (1.1 MiB)
EOF;


$interfaces = array();
foreach (preg_split("/\n\n/", $data) as $int) {

    preg_match("/^([A-z]*\d.?\d*)\s+Link\s+encap:([A-z]*)\s+HWaddr\s+([A-z0-9:]*).*" .
            "inet addr:([0-9.]+).*Bcast:([0-9.]+).*Mask:([0-9.]+).*" .
            "MTU:([0-9.]+).*Metric:([0-9.]+).*" .
            "RX packets:([0-9.]+).*errors:([0-9.]+).*dropped:([0-9.]+).*overruns:([0-9.]+).*frame:([0-9.]+).*" .
            "TX packets:([0-9.]+).*errors:([0-9.]+).*dropped:([0-9.]+).*overruns:([0-9.]+).*carrier:([0-9.]+).*" .
            "RX bytes:([0-9.]+).*\((.*)\).*TX bytes:([0-9.]+).*\((.*)\)" .
            "/ims", $int, $regex);

    if (!empty($regex)) {

        $interface = array();
        $interface['name'] = $regex[1];
        $interface['type'] = $regex[2];
        $interface['mac'] = $regex[3];
        $interface['ip'] = $regex[4];
        $interface['broadcast'] = $regex[5];
        $interface['netmask'] = $regex[6];
        $interface['mtu'] = $regex[7];
        $interface['metric'] = $regex[8];

        $interface['rx']['packets'] = (int) $regex[9];
        $interface['rx']['errors'] = (int) $regex[10];
        $interface['rx']['dropped'] = (int) $regex[11];
        $interface['rx']['overruns'] = (int) $regex[12];
        $interface['rx']['frame'] = (int) $regex[13];
        $interface['rx']['bytes'] = (int) $regex[19];
        $interface['rx']['hbytes'] = (int) $regex[20];

        $interface['tx']['packets'] = (int) $regex[14];
        $interface['tx']['errors'] = (int) $regex[15];
        $interface['tx']['dropped'] = (int) $regex[16];
        $interface['tx']['overruns'] = (int) $regex[17];
        $interface['tx']['carrier'] = (int) $regex[18];
        $interface['tx']['bytes'] = (int) $regex[21];
        $interface['tx']['hbytes'] = (int) $regex[22];

        $interfaces[] = $interface;
    }
}
print_r($interfaces);