I developed a search engine on my website. But each time i try to seacrh fo a thing in the mysql database i receive : "we dont seem to have the search parameter" as the error message. pls what is the possible error and solution

I believe that noone can answer you this question. Even with lots of experience in php/mysql programming one would need to analyze your script and database data to see why the script doesn't return any results.
Try a step by step debugging: insert a series of echo... / exit; in various parts of your script to be able to see the flow and check if the cortect parameters / variables are passed through all parts of the script.

Sometimes, even a white space by mistake added to the databased stored info, could be enough to create such problems.

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index.php
File Type: PHP script text

This is the php page: www.onitshabusinessdirectory.com/searchproduct.This is the script after succefull connection to the database and the databatable:

//specify how many results to display per page
$limit = 10;
// Get the search variable from URL
$var = @$_GET['q'] ;
//trim whitespace from the stored variable
$trimmed = trim($var);
//separate key-phrases into keywords
$trimmed_array = explode(" ",$trimmed);
// check for an empty string and display a message.
if ($trimmed == "") {
$resultmsg = "<p>Search Error</p><p>Please enter a search...</p>" ;
}
// check for a search parameter
if (!isset($var)){
$resultmsg = "<p>Search Error</p><p>We don't seem to have a search parameter! </p>" ;
}
// Build SQL Query for each keyword entered
foreach ($trimmed_array as $trimm){
// EDIT HERE and specify your table and field names for the SQL query
$query = "SELECT * FROM onitsha_product_directory WHERE business_location LIKE '%$trimm%' OR type_of_location like '%$trimm%' OR type_of_business like '%$trimm%' ORDER BY id DESC" ;
// Execute the query to get number of rows that contain search keywords
$numresults=mysql_query ($query);
$row_num_links_main = mysql_num_rows ($numresults);
// next determine if 's' has been passed to script, if not use 0.
// 's' is a variable that gets set as we navigate the search result pages.
if (empty($s)) {
$s=0;
}
// now let's get results.
$query .= " LIMIT $s,$limit" ;
$numresults = mysql_query ($query) or die ( "Query couldn't be executed" );
$row= mysql_fetch_array ($numresults);
//store record id of every item that contains the keyword in the array we need to do this to avoid display of duplicate search result.
do{
$adid_array[] = $row[ 'id' ];
}while( $row= mysql_fetch_array($numresults));
} //end foreach
if($row_num_links_main == 0 && $row_set_num == 0){
$resultmsg = "<p>Search results for: ". $trimmed."</p><p>Sorry, your search returned zero results</p>" ;
}
//delete duplicate record id's from the array. To do this we will use array_unique function
$tmparr = array_unique($adid_array);
$i=0;
foreach ($tmparr as $v) {
$newarr[$i] = $v;
$i++;
}
// now you can display the results returned. But first we will display the search form on the top of the page
?>
<form action="search.php" method="get" name="search">
<div align="center">
<input name="q" type="text" value=" <?php echo $q; ?> " size="15">
<input name="search" type="submit" value="Search">
</div>
</form>
<?php
// display what the person searched for.
if( isset ($resultmsg)){
echo $resultmsg;
exit();
}else{
echo "Search results for: " . $var;
}
foreach($newarr as $value){
// EDIT HERE and specify your table and field names for the SQL query
$query_value = "SELECT * FROM onitsha_product_directory WHERE id = '$value'";
$num_value=mysql_query ($query_value);
$row_linkcat= mysql_fetch_array ($num_value);
$row_num_links= mysql_num_rows ($num_value);
//now let's make the keywods bold. To do that we will use preg_replace function.
//Replace field
$titlehigh = preg_replace ( "'($var)'si" , "<b> //1</b>" , $row_linkcat[ 'business_location' ] );
$linkhigh = preg_replace ( "'($var)'si" , "<b> //1</b>" , $row_linkcat[ 'type_of_location' ] );
$linkdesc = preg_replace ( "'($var)'si" , "<b> //1</b>" , $row_linkcat[ 'type_of_business' ] );
foreach($trimmed_array as $trimm){
if($trimm != 'b' ){
$titlehigh = preg_replace( "'($trimm)'si" , "<b> //1</b>" , $titlehigh);
$linkhigh = preg_replace( "'($trimm)'si" , "<b> //1</b>" , $linkhigh);
$linkdesc = preg_replace( "'($trimm)'si" , "<b> //1</b>" , $linkdesc);
}
//end highlight
?>
<p>
<?php echo $titlehigh; ?><br>
<?php echo $linkhigh; ?><br>
<?php echo $linkhigh; ?>
</p>
<?php
} //end foreach $trimmed_array
if($row_num_links_main > $limit){
// next we need to do the links to other search result pages
if ($s>=1) { // do not display previous link if 's' is '0'
$prevs=($s-$limit);
echo "<div align='left'><a href='$PHP_SELF?s=$prevs&q=$var&catid=$catid'>Prev ious " .$limit. "</a></div>";
}
// check to see if last page
$slimit =$s+$limit;
if (!($slimit >= $row_num_links_main) && $row_num_links_main!=1) {
// not last page so display next link
$n=$s+$limit;
echo "<div align='right'><a href='$PHP_SELF?s=$n&q=$var&catid=$catid'>Next " .$limit. "</a></div>";
}
}
} //end foreach $newarr
?>