Why does it keep showing failure?

<?php
  header("Content-Type: text/html; charset=utf-8");
  


  $advice_content=$_POST["textarea"];//posttextarea
  $uphonenumber=$_POST["uphonenumber"];//postuphonenumber

  
  if(empty($uphonenumber) || empty($advice_content)){
               echo "";            
            }
  include("init.php");//
  $sql="insert into yffice_advice(id,advice-content,uphonenumber) values (null,"$advice_content","$uphonenumber")";//sql
  mysql_query("SET NAMES utf8"); 
  $result=mysql_query($sql);//sql
  if($result){
    echo "";
    }else{
    echo "";
    }
  mysql_close();//

?>

this is the returned result:

clipboard.png

echo $sql$result:

clipboard.png

Php
Mar.05,2021

solved it by myself. I just messed with the column name of the database without adding-

what error does it suggest? Post the error result

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea8ab8-1ef9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea8ab8-1ef9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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