PHP implementation of online port scanning example code_PHP tutorial

1. 
   $youip=$HTTP_SERVER_VARS["REMOTE_ADDR"];
   $remoteip=$HTTP_POST_VARS[remoteip];
   ?>
12. 
    if (!empty($remoteip)){
    function err() {
        die(" 对不起，该IP地址不合法

    点击这里返回");
    }
     // 定义提交错误IP的提示信息
    $ips=explode(".",$remoteip);
     // 用.分割IP地址
     if (intval($ips[0])<1 or intval($ips[0])>255 or intval($ips[3])<1 or intval($ips[3]>255)) err();
    // 如果第一段和最后一段IP的数字小于1或者大于255，则提示出错
     if (intval($ips[1])<0 or intval($ips[1])>255 or intval($ips[2])<0 or intval($ips[2]>255)) err();
    // 如果第二段和第三段IP的数字小于0或者大于255，则提示出错
    $closed=此端口目前处于关闭状态。;
    $opened=This port is currently open!;
    $close="Close";
    $open="Open";
    $port=array(21,23,25,79,80,110,135,137,138,139,143,443,445,1433,3306,3389);
    $msg=array(Ftp,Telnet,Sm tp ,Finger,Http,Pop3,Location Service,Netbios-NS,Netbios-DGM,Netbios-SSN,IMAP,Https,Microsoft-DS,MSSQL,MYSQL,Terminal Services);
    // Pass After checking the IP format, use an array to define the service name and status corresponding to each port
    echo "

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

    The IP you scanned: ".$remoteip."

    ";
    echo " ";
    echo " ";
    echo " ";
    echo " ";
    echo " ";
    echo " ";
    echo " ";
    //Output the displayed table
    for($i=0;$i
    {
    $fp = @fsockopen($remoteip, $port[$i], &$errno, &$errstr, 1);
    if (!$fp) {
    echo "< td>".$msg[$i]." ";
    } else {
    echo "";
    }
    }
    // Use the for statement to connect to the relevant ports of the remote host using the fsockopen function, and output the results
    echo "
    echo "

    port	Service	Detection results	description
    ".$port[$i]."	".$close."	".$closed."
    ".$port[$i]."	".$msg[$i]."	".$open."	".$opened ."
    "; echo "Continue scanning>>>< /td> "; echo "

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

    port scan

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