キャッチできる致命的なエラー：クラスmysqli_resultのオブジェクトがライン上で文字列に変換することができませんでした44

Question

I am trying to insert data into a table but getting this error- Catchable fatal error: Object of class mysqli_result could not be converted to string on line 44 the error is showing for the following line.

$query= "insert into product(proname,prodesc,proprice,proimg,catid) values('$proname','$prodesc','$proprice','$file_path','$catid')"; 
      if(mysqli_query($conn,$query)){ 
       header('location:product.php'); 
      } 
      else{ 
       echo 'cant insert data'.mysqli_error($conn); 
      } 
     } 
    } 
    ?> 

following is the entire program

$errors=array(); 
if(!(empty($_POST))){ 
    $proname=$_POST['proname']; 
    $proprice=$_POST['proprice']; 
    $prodesc=$_POST['prodesc']; 
    $catname=$_POST['cat']; 
    $catid=mysqli_query($conn,"select catid from category where catname='$catname'") or die('cant get category id'.mysqli_error($conn)); 
    if(empty($proname) or empty($proprice)){ 
     $errors[]='Please enter product name and price.'; 
    } 
    if(isset($_FILES['proimg'])){ 
     $file_name = $_FILES['proimg']['name']; 
     $file_size =$_FILES['proimg']['size']; 
     $file_tmp =$_FILES['proimg']['tmp_name']; 
     $file_type=$_FILES['proimg']['type']; 
     $file_ext=strtolower(end(explode('.',$_FILES['proimg']['name']))); 
     $expensions= array("jpeg","jpg","png"); 
     $file_path='imgproduct/'.$file_name; 
     if(in_array($file_ext,$expensions)=== false){ 
      $errors[]="extension not allowed, please choose a JPEG or PNG file."; 
     } 
    } 
    else{ 
     $errors[]='Please upload an image of product'; 
    } 
    if(!(empty($errors))){ 
     print_r($errors); 
    } 
    else{ 
     if(!(move_uploaded_file($file_tmp,$file_path))) { 
      echo '1.file not uploaded'; 
      exit; 
     } 
     $query= "insert into product(proname,prodesc,proprice,proimg,catid) values('$proname','$prodesc','$proprice','$file_path','$catid')"; 
     if(mysqli_query($conn,$query)){ 
      header('location:product.php'); 
     } 
     else{ 
      echo 'cant insert data'.mysqli_error($conn); 
     } 
    } 
} 
?> 

Answer 1

変更

$query= "insert into product(proname,prodesc,proprice,proimg,catid) values('$proname','$prodesc','$proprice','$file_path','$catid')"; 

$query= "insert into product(proname,prodesc,proprice,proimg,catid) values($proname,$prodesc,$proprice,$file_path,$catid)"; 

Answer 2

ソルへ前回の回答はryです。今すぐ問題を解決することを願っています。

$row = mysqli_fetch_array($result); $catid = $row['catid'];

$errors=array(); 
if(!(empty($_POST))){ 
    $proname=$_POST['proname']; 
    $proprice=$_POST['proprice']; 
    $prodesc=$_POST['prodesc']; 
    $catname=$_POST['cat']; 
    $result =mysqli_query($conn,"select catid from category where catname='$catname'") or die('cant get category id'.mysqli_error($conn)); 
    $row = mysqli_fetch_array($result); 
    $catid = $row['catid']; 

    if(empty($proname) or empty($proprice)){ 
     $errors[]='Please enter product name and price.'; 
    } 
    if(isset($_FILES['proimg'])){ 
     $file_name = $_FILES['proimg']['name']; 
     $file_size =$_FILES['proimg']['size']; 
     $file_tmp =$_FILES['proimg']['tmp_name']; 
     $file_type=$_FILES['proimg']['type']; 
     $file_ext=strtolower(end(explode('.',$_FILES['proimg']['name']))); 
     $expensions= array("jpeg","jpg","png"); 
     $file_path='imgproduct/'.$file_name; 
     if(in_array($file_ext,$expensions)=== false){ 
      $errors[]="extension not allowed, please choose a JPEG or PNG file."; 
     } 
    } 
    else{ 
     $errors[]='Please upload an image of product'; 
    } 
    if(!(empty($errors))){ 
     print_r($errors); 
    } 
    else{ 
     if(!(move_uploaded_file($file_tmp,$file_path))) { 
      echo '1.file not uploaded'; 
      exit; 
     } 
     $query= "insert into product(proname,prodesc,proprice,proimg,catid) values('$proname','$prodesc','$proprice','$file_path','$catid')"; 
     if(mysqli_query($conn,$query)){ 
      header('location:product.php'); 
     } 
     else{ 
      echo 'cant insert data'.mysqli_error($conn); 
     }