php dynamic search build query

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<?php
 $hostName = "localhost";
 $userName = "root";
 $password = "";
 $dbName = "pobpaper";
 $conn= new mysqli($hostName,$userName,$password,$dbName);
 if(!$conn){
    echo "DB is not connected";
 }

 $jt = $_GET["jt"];
 $jc = $_GET["jc"];

 $myArr = [];

 if($jt != NULL){
    $new = explode(" ", $jt);
    echo $new[0];
    $c = count($new);
    echo $c;
    if($c == 1){
        if($new[0] == 'remote'){
            array_push($myArr,(object)["st"=> 'jobtype','jtid'=>'1']);
        }
        else{
            array_push($myArr,(object)["st"=> 'jobtype','jtid'=>'2']);

        }

    }
    else if($c == 2){
        if($new[0] == 'remote'){
            echo 'came';
            array_push($myArr,(object)["st"=> 'jobtype','jtid'=>'1,2']);
        }
        else{
            array_push($myArr,(object)["st"=> 'jobtype','jtid'=>'2,1']);
        }
    }
    echo 'array length';
    echo count($myArr);
 }
 if($jc != NULL){
    $new = explode(" ", $jc);
    echo $new[0];
    $c = count($new);
    echo $c;
    if($c == 1){
        if($new[0] == 'nodejs'){
            array_push($myArr,(object)["st"=> 'jobcategory','jtid'=>'1']);
        }
        else{
            array_push($myArr,(object)["st"=> 'jobcategory','jtid'=>'2']);

        }

    }
    else if($c == 2){
        if($new[0] == 'nodejs'){
            echo 'came';
            array_push($myArr,(object)["st"=> 'jobcategory','jtid'=>'1,2']);
        }
        else {
            array_push($myArr,(object)["st"=> 'jobcategory','jtid'=>'2,1']);

        }
    }
 }

 echo"array 12" ;
 var_dump($myArr[0]-> st);
 if(count($myArr) == 1){
     $firs = $myArr[0]-> st;
     $sec = $myArr[0]-> jtid;


        $query = "SELECT * FROM sometable WHERE `$firs` IN ($sec)";

 
     echo $query;
     $result = mysqli_query($conn,$query);
     while($row = mysqli_fetch_assoc($result)){
        echo " ". $row['sno'] ;
    }
 }
 else if(count($myArr) == 2){
    $firs = $myArr[0]-> st;
    $sec = $myArr[0]-> jtid;
    $firs2 = $myArr[1]-> st;
    $sec2 = $myArr[1]-> jtid;

     $query = "SELECT * FROM sometable WHERE `$firs` IN ($sec) AND `$firs2` IN ($sec2)";

 
    echo $query;
    $result = mysqli_query($conn,$query);
    while($row = mysqli_fetch_assoc($result)){
       echo " ". $row['name'] ;
   }

 }
//  $subname = $_GET["subname"];

?>

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