full text ranking [duplicate] - php

Question

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Closed 10 years ago.
Possible Duplicate:
how to have ranking based on how many words match user input
How can I have a search engine ranked by amount of words that are typed in and ranked by the amount of types they crop up in the fields title, description, keywords, link.
So the higher results are ordered by having more of the words that the user submitted. Say if the user typed in iPhone, iPhone key word crops up in the link, description and title field, so that would be ranked higher than say Apple which mentions it only in the description and Apple Store which mentions it in the title and the description.
My code is below:
$query = " SELECT * FROM scan WHERE ";
$terms = array_map('mysql_real_escape_string', $terms);
$i = 0;
foreach ($terms as $each) {
if ($i++ !== 0){
$query .= " AND ";
}
$query .= "Match(title, description, keywords, link) Against ('".implode(' ',$terms)." IN BOOLEAN MODE') ";
}
$secs = microtime();
$query = mysql_query($query) or die('MySQL Query Error: ' . mysql_error( $connect ));
echo '<p class="time">Qlick showed your results in ' . number_format($secs,2) . ' seconds.</p>';
$numrows = mysql_num_rows($query);
if ($numrows > 0) {
while ($row = mysql_fetch_assoc($query)) {
$id = $row['id'];
$title1 = $row['title'];
$description = $row['description'];
$keywords = $row['keywords'];
$link = $row['link'];
$rank = $row['rank'];
$title = substr($title1,0,60);
echo '<h2><a class="ok" href="' . $link . '">' . $title . '</a></h2>' . PHP_EOL;
echo '<p class="kk">' . $description . '<br><br><span class="keywords">' . PHP_EOL;
echo '<p><a class="okay" href="' . $link . '">' . $link . '<br><br><span class="keywords">' . PHP_EOL;
}

Answer 1

While I'm sure it is possible to implement this within mysql, a full-text search index like solr/lucene is designed to handle this stuff directly. You might find better resources & help going down that road.
Using php, copy the array returned by the mysql query:
while ($row = mysql_fetch_assoc($query))
{
$rows[] = $row;
}
Then you can loop over $rows and assign a score to
foreach ($rows as $row)
$row['score'] = score_row($row, $terms)
score_row is a helper method that returns a bigger score depending on which columns have which terms and your definition of "importance".
Then sort thw rows by score, then print the results as you were doing.