变量确实在PHP中传递

Here I want to assign $part1 and $part2 value into Mysqli query. But what is the problem is $part2 value does not get into query. I could not be able to find what would be the wrong with my code.

$string = 'Enter a domain name' . "
";
socket_write($client, $string, strlen($string)) or die("Could not write output
");

$str = '';
while ($input = socket_read($client, 1024)) {
$str .= $input;
if (strpos($str, "
") !== false) {
    break 1;
}}
$part = explode(".", $str);
$part1 = $part[0];
$part2= $part[1];

$sql =  "SELECT DomainCategory.Name "
    . "FROM DomainName_Client, DomainNameType, DomainCategory, OrderDomain_Client "
    . "WHERE DomainName_Client.Name='$part1' "
    . "AND DomainNameType.Name='$part2' "
    . "AND DomainName_Client.TypeID=DomainNameType.ID "
    . "AND DomainCategory.ID=DomainName_Client.DomainCategoryID "
    . "AND OrderDomain_Client.DomainNameID=DomainName_Client.ID";

      $result = $mysqli->query($sql);
      $row1 = $result->num_rows;

if ($row1 > 0) {

$row = $result->fetch_array(MYSQLI_NUM);
printf("%s
", $row[0]);
} else {
echo 'This is not a Registered Domain';
}

Use {$part2} and also check that $part2 has value after asignment

$sql =  "SELECT DomainCategory.Name "
    . "FROM DomainName_Client, DomainNameType, DomainCategory, OrderDomain_Client "
    . "WHERE DomainName_Client.Name='{$part1}' "
    . "AND DomainNameType.Name='{$part2}' "
    . "AND DomainName_Client.TypeID=DomainNameType.ID "
    . "AND DomainCategory.ID=DomainName_Client.DomainCategoryID "
    . "AND OrderDomain_Client.DomainNameID=DomainName_Client.ID";

Connect with PDO

    try
     {
      $dbh = new PDO("pgsql:host=$host;port=5432;dbname=$db;user=$user;password=$pass");
      echo "Connected
";
    }
    catch (Exception $e)
    {
      echo "Unable to connect: " . $e->getMessage() ."
";
    }

Prepare your statment:

        $sth = $dbh->prepare("SELECT DomainCategory.Name "
        . "FROM DomainName_Client, DomainNameType, DomainCategory,                OrderDomain_Client "
        . "WHERE DomainName_Client.Name='?' "
        . "AND DomainNameType.Name='?' "
        . "AND DomainName_Client.TypeID=DomainNameType.ID "
        . "AND DomainCategory.ID=DomainName_Client.DomainCategoryID "
        . "AND OrderDomain_Client.DomainNameID=DomainName_Client.ID");

And Execute:

`enter code here`
    $sth->execute(array($part1, $part2));
    $red = $sth->fetchAll();

Use Join Query rather then simple select Query with where condition

`"SELECT DomainCategory.Name FROM DomainName_Client join DomainNameType on DomainNameType.ID = DomainName_Client.TypeID join DomainCategory on DomainCategory.ID=DomainName_Client.DomainCategoryID join OrderDomain_Client on OrderDomain_Client.DomainNameID=DomainName_Client.ID WHERE DomainName_Client.Name = '".$part1."' AND DomainNameType.Name = '".$part2."'";`

As suggested by Combinu, PDO is the better way to go. However, to go along with your idea, I would concatenate the content of the variables.

$sql =  "SELECT DomainCategory.Name "
. "FROM DomainName_Client, DomainNameType, DomainCategory, OrderDomain_Client "
. "WHERE DomainName_Client.Name= ". $part1
. "AND DomainNameType.Name= " . $part2
. "AND DomainName_Client.TypeID=DomainNameType.ID "
. "AND DomainCategory.ID=DomainName_Client.DomainCategoryID "
. "AND OrderDomain_Client.DomainNameID=DomainName_Client.ID";