php - sql 'incorrect integer value' message -

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can see why getting following error when try submit this? know whole null vs '' thing don't have '' should causing this. new mysql great.

incorrect integer value='' column 'two' @ row 1

<?php  $db_host = "localhost"; $db_username = "test";  $db_pass = "example";  $db_name = "questions";  @mysql_connect("$db_host","$db_username","$db_pass") or die ("could not connect mysql"); @mysql_select_db("$db_name") or die ("no database");   if ($_post['parse_var'] == "contactform"){   $onefield = $_post['one']; $twofield = $_post['two']; $threefield = $_post['three']; $nonefield = $_post['none']; $surveyfield = $_post['survey']; $questionfield = $_post['questions']; $guestfield = $_post['guest']; $homefield = $_post['home'];   $selected_radio = $_post['radio'];   if ($selected_radio == 'one')    {   $onefield = '1';   }    else if ($selected_radio == 'two')    {   $twofield = '1';   }    else if ($selected_radio == 'three')    {   $threefield = '1';   }    else if ($selected_radio == 'none')    {   $nonefield = '1';   }   if($surveyfield == "yes"){ $surveyfield = "1";  }  if($mysqlfield == "yes"){ $mysqlfield = "1";  }  if($guestbookfield == "yes"){ $guestbookfield = "1";  }  if($homefield == "yes"){ $homefield = "1";  }   $sqlupdate = mysql_query("insert questiondata (one, two, three, none, survey,         question, guest, home)  values  ('$onefield','$twofield','$threefield','$nonefield','$surveyfield','$questionfield','$guestfield','$homefield')")  or die (mysql_error()); } ?>

you're trying insert 1 of integer arguments being empty, i.e.:

insert questiondata (one, two) values ('1','')

this not work unless one or two string fields.
modify code empty variables initialized:

$onefield = isset($_post['one']) ? $_post['one'] : 0; $twofield = isset($_post['two']) ? $_post['two'] : 0;

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