Search using php . comparing keyward to multiple columns in same table

                                                                      <?php
//get data
session_start();

$button = $_GET['submit'];
$search = $_GET['search'];
if (!$button)
    echo "YOU DIDNT SUBMIT A KEYWORD";
else
{
   if (strlen($search)<=2)
       echo "SEARCH TERM TOO SHORT";
   else
   {
       echo"You searched for <b>$search</b><hr size='1'>";


   //connect to database
   include("connect.php");



    // a bit of filtering
 $search = strtoupper($search);
 $search= strip_tags($search);
 $search = trim ($search);

$search_exploded = explode(" ",$search);

foreach ($search_exploded as $search_each)

       {
          //construct query
           $x++;
           if ($x==1)
             $construct .= "CONCAT(role_category1, role_category2, role_category3, role_category4) LIKE '%$search_each%'";
           else
               $construct .= " OR CONCAT(role_category1, role_category2, role_category3, role_category4) LIKE '%$search_each%'";

       }
   //echo out construct
$construct = "SELECT * FROM  jobdescription WHERE $construct";
$run = mysql_query($construct);

$foundnum = mysql_num_rows($run);

if ($foundnum==0)
    echo "No results found.";
else
    {
     echo "$foundnum results found!<p>";

     while ($runrows = mysql_fetch_assoc($run))
         {

         $jobdescriptionid = $runrows['jobdescriptionid'];

         $companyid = $runrows['companyid'];
         $companyid = $runrows['companyid'];
         $role_1= $runrows['role_1'];
         $role_location_1 = $runrows['role_location_1'];
         $role_category_1 = $runrows['role_category_1'];
         $role_term_1 = $runrows['role_term_1'];
         $role_description_1 = $runrows['role_description_1'];
          $role_2= $runrows['role_2'];
         $role_location_2 = $runrows['role_location_2'];
         $role_category_2 = $runrows['role_category_2'];
         $role_t开发者_如何学Cerm_2 = $runrows['role_term_2'];
         $role_description_2 = $runrows['role_description_2'];

         echo "
         <b>$companyid
          <b>$jobseekerfirstname $jobseekerlastname </b><br>
         $role_1<br>
         $role_location_1<br>
         $role_category_1<br>

          $role_2<br>
         $role_location_2<br>
         $role_category_2<br>";




 }
        }}}

?> am using the php script but its still now identifying what am searching for. Am trying to search for fields in the same table but different columns (heads of these columns are role_category1,role_category2.....) any suggestions

$construct .= "'role_category_1' || 'role_category_2' || 'role_category_3' || 'role_category_4' OR preferedlocation LIKE '%$search_each%'";

in MySQL, concatenation is done via the CONCAT() function - you're doing bitwise OR operations on strings, so your construct is treated as:

string || string || string || string LIKE '%blahblahblah%'

which becomes

0 || 0 || 0 || 0 LIKE '%blahblah%';
0 || (0 LIKE '%blahblah%')
0

As well, since you put single quotes around the field names, MySQL will treat them as strings, not as field names, so you were in effect trying to match your input text string against a fixed string that looks like

role1_category1role_category2role_category3role_category4

You want

$construct .= "CONCAT(role_category1, role_category2, role_category3, role_category4) LIKE '%blahblah%'";

instead. Note the lack of quotes around the field names.