Local search engine - preview result?

[reptilianfeline]

I'm trying to put together a search engine for a site. I can't use a db, because the information about each item is stored in a txt-file, so I need to search them instead. That part is working, together with a way of highlighting the search words.
The problem is the chunk of text I want to display.

I want it to cut in whole words, not just after X number of caracters. I also want it to start about 5 or so words before the first search word, (if there are words before it). I've been searching the forum, but no example deals with multiple search words where the content is taken from a text file.

This is the code so far:

<?php
//$keywords = strip_tags(trim($_POST['keywords']));
function search_find($keywords)
{
    $key_array = explode(" ",$keywords);
    foreach ($key_array as $word) 
    { 
        $words[] = preg_quote($word, '/'); 
    } 
    $highlight_words = implode('|', $words);     
    $keys = implode("|",$key_array);
    $keyword = str_pad($keys,strlen($keys)+2,"#",STR_PAD_BOTH);
    $search_pattern = str_pad($keyword,strlen($keyword)+1,"i");
    foreach (glob("*.txt") as $filename) 
    {
        $filecontent = file_get_contents($filename);
        if (preg_match_all($search_pattern,$filecontent,$match))
        {
            $start = strpos($filecontent,"<p>");
            $content = strip_tags(substr($filecontent,$start));
            $number = str_word_count($content); //I thought I might use this to find out where to start and end...
            echo preg_replace("/($highlight_words)/i", '<strong>$1</strong>', $content).'...<br>';
            echo '<br><a href="show_prod.php?prodid='.$filename.'">'.$filename.'</a><hr>';
        }
    }
}
search_find('word 2000');
?>

I have tried with the $start set to $match[0][0] together with the length X number of caracters. That didn't work out the way I wanted it either. I placed the strip_tags() differently then.

This script will also have options for an AND search, and not just an OR search as it is now. That part is easy to make the way the script is now. The whole script is case insensitive.

Please help me!

[Gaheris]

See if my code in this thread helps you.

[reptilianfeline]

See if my code in this thread helps you.

I had worked with your code before, taking parts of it and adapting it, but couldn't get it working. I tried again, and it worked great I guess I was a little tired yesterday.

So... to all those out there who are trying to do the same thing... I give you the code for the function. You have to put together your own form though

$keywords = strip_tags(trim($_REQUEST['keywords']));
$search_type = $_REQUEST['search_type'];
function search_find($keywords,$search_type)
{
//Set numbers of words to pad the result with
    $config = array('words'  => array('before' => 5, 'after' => 20)); 
    $key_array = explode(" ",$keywords);
//Get the words to highlight later
    foreach ($key_array as $word) 
    { 
        $words[] = preg_quote($word, '/'); 
    } 
    $highlight_words = implode('|', $words);
//Boolean AND type of search
    if ($search_type == 'all') 
    {
        $keys = implode(" ",$key_array);
    }
//Boolean OR type of search
    else
    {
        $keys = implode("|",$key_array);     
    }
//Get a proper search-string for preg_match_all
    $keyword = str_pad($keys,strlen($keys)+2,"#",STR_PAD_BOTH); 
//Make it case insensitive
    $search_pattern = str_pad($keyword,strlen($keyword)+1,"i");
//Search all files with the txt-filetype 
    foreach (glob("*.txt") as $filename) 
    {
//Get the content of the file
            $filecontent = file_get_contents($filename); 
//See if the content maches any or all keywords
            if (preg_match_all($search_pattern,$filecontent,$match)) 
            {
//Start putting out the result on the first paragraph, or put in any other type of start code to look for
                $start = strpos($filecontent,"<p>");
//Remove all the HTML and PHP
                  $content = strip_tags(substr($filecontent,$start)); 
//Divide content into words
                $a_str = explode(' ', $content); 
//Find the first keyword match
                $key = array_search($match[0][0], $a_str); 
//Set start and end padding
                $start  = (isset($a_str[$key - $config['words']['before']])) ? $key - $config['words']['before'] : 0; 
                 $end    = (isset($a_str[$key + $config['words']['after']])) ? $key + $config['words']['after'] : sizeof($a_str) - 1;
//Cut out portion of content to display
                $a_ret  = array_slice($a_str, $start, $end - $start); 
//Put it together with ...
                $s_ret  = '...'.implode(' ', $a_ret).'...'; 
//Highlight all visible keywords
                  echo preg_replace("/($highlight_words)/i", '<strong>$1</strong>',$s_ret); 
//This part can be ommited, but is useful for separating the files if different linktypes are to be displayed
                if (($filename == 'image.txt') || ($filename == 'database.txt') || ($filename == 'desktop.txt')) 
                {
//Make the dynamic link
                    echo '<br><a href="show_cat.php?katid='; 
//This part demonstrates a switch when filename doesn't equal the link id.
                    switch($filename): 
                        case 'image.txt':
                        echo '1';
                        break;
                        case 'database.txt':
                        echo '2';
                        break;
                        case 'desktop.txt':
                        echo '3';
                        break;
                    endswitch;
//Close the link tag                        
                    echo '">Show</a><hr>';
                }
                else
                {
//This part shows how the link works when filename is the same as id, and removes .txt from name.
                    echo '<br><a href="show_prod.php?prodid='.substr($filename,0,-4).'">Show</a><hr>'; 
                }
            }

    }
} 

Then all you do is call it with search_find($keywords,$search_type)

[Gaheris]

Glad my code could help you, looks like you put together some nice functionality in that function of yours.

[reptilianfeline]

That's how I work , trying to think of any possibility.

It has to be easy to use, look nice, and be easy to modify and update. The more coding I do, the more imåportant the updateability becomes