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Hi,
I’ve successfully compiled a Search Engine using PHP to search my MySQL database, matching keywords and returning results. However, I need a way to rank the results so that if one entry in the database has 3 words matching it should appear before an entry with only 1 word matching. At the moment results are returned in the order they are in the database.
Code:
[FONT=”Courier New”]<?php include(‘header.php’);
echo”<div id=mainpage><h2>Questions: (click for the answer)</h2><br><br>”;
//This is a working script
//Make sure to go through it and edit database table filelds that you are seraching
//This script assumes you are searching 3 fields
//specify how many results to display per page
$limit = 10;
// Get the search variable from URL
$var = @$_POST[‘question’] ;
//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 == “”) {
$resultmsg = “<h2>Search Error</h2>Please enter a question!<br><a href=index.php>Click here to go back</a>” ;
}
// check for a search parameter
if (!isset($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
$query = “SELECT * FROM Answers WHERE Keywords LIKE “%$trimm%”” ;
// Execute the query to get number of rows that contain search kewords
$numresults=mysql_query ($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 ( “Couldn’t execute query” );
$row= mysql_fetch_array ($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{
//EDIT HERE and specify your field name that is primary key
$adid_array[] = $row[ ‘ID’ ];
}while( $row= mysql_fetch_array($numresults));
} //end foreach
if($row_num_links_main == 0 && $row_set_num == 0){
$resultmsg = “<h2>Search results for:” . $trimmed .”</h2>Sorry, your search returned zero results, try rephrasing your question<br><a href=index.php>Click here to go back</a>” ;
}
//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 $value) {
$newarr[$i] = $value;
$i++;
}
// display what the person searched for.
if( isset ($resultmsg)){
echo $resultmsg;
exit();
}
foreach($newarr as $value){
// EDIT HERE and specify your table and field names for the SQL query
$query_value = “SELECT * FROM Answers WHERE ID = ‘$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.
//EDIT parts of the lines below that have fields names like $row_linkcat[ ‘field1’ ]
//This script assumes you are searching only 3 fields. If you are searching more fileds make sure that add appropriate line.
$titlehigh = preg_replace ( “‘($var)’si” , “<b>
foreach($trimmed_array as $trimm){
if($trimm != ‘b’ ){
//IF you added more fields to search make sure to add them below as well.
$titlehigh = preg_replace( “‘($trimm)’si” , “<b>
$qq = $row_linkcat[‘Question’];
$id = $row_linkcat[‘ID’];
}
//end highlight
?>
<?php
if($badger!=$id){
$badger=x;
echo “<a href=answer.php?id=$id>$qq</a><br>”;
$badger=$id;
}
?>
<?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=$catid’>Previous ” .$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
echo “</div>”;
include(‘footer.php’);?> [/FONT]