PHP implementation of online port scanning instance Code _php tutorial

2. 
   $youip = $HTTP _server_vars["REMOTE_ADDR"];
   $REMOTEIP = $HTTP _post_vars[remoteip];
   ?>
10. PHP implements port on-line detection
23. 
    if (!empty ($REMOTEIP)) {
    function Err () {
    Die ("Sorry, this IP address is not valid

    Click here to return ");
    }
    //define the prompt to submit the wrong IP
    $ips =explode (".", $remoteip);
    //use. Split IP address
    if (intval ($ips [0]) <1 or intval ($ips [0]) >255 or Intval ($ips [3]) <1 or intval ($ips [3]>255)) Err ();
    //If the first and last IP numbers are less than 1 or greater than 255, an error is prompted
    if (Intval ($ips [1]) <0 or Intval ($ips [1]) >255 or Intval ($ips [2]) <0 or intval ($ips [2]>255)) Err ();
    //If the number of the second and third IP is less than 0 or greater than 255, an error is prompted
    $closed = This port is currently in a closed state.;
    $opened = This port is currently open!;
    $close = "Off";
    $open = "open";
    $port =array (21,23,25,79,80,110,135,137,138,139,143,443,445,1433,3306,3389);
    $msg =array (ftp,telnet,smtp,finger,http,pop3,location Service,netbios-ns,netbios-dgm,netbios-ssn,imap,https, Microsoft-ds,mssql,mysql,terminal Services);
    //After checking by IP format, define the service name and status of each port with an array
    echo "

    
    echo "
    echo "
    echo "
    echo " "; "; "; ";

    The IP you scanned: ". $remoteip."

    ";
    echo "
    echo "
    echo "
    echo "
    echo "
    echo "
    echo "
    //Output display table
    For ($i =0; $i < span="">
    {
    $fp = @fsockopen ($remoteip, $port [$i], & $errno, & $errstr, 1);
    if (! $fp) {
    echo "
    } else {
    echo "
    }
    }
    //Use the Fsockopen function to connect the relevant port of the remote host with the For statement, and output the result
    echo "
    echo "
    echo " "; "; "; "; "; "; "; "; "; ";

    Port	Service	Test results	Describe
    ". $port [$i]."	". $msg [$i]."	". $close."	". $closed."
    ". $port [$i]."	". $msg [$i]."	". $open."	". $opened."
    "; echo "Continue scanning >>>

    ";
    echo "
    echo "
    echo "
    echo "
    echo " "; "; "; ";

    Port scan

    ";
    echo "";
    echo "";
    echo "";
    exit;
    

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