Posted by Richard Lynch on 05/11/05 06:14

On Tue, May 10, 2005 5:58 am, Merlin said:
> I am writing an internal full text search engine and do have trouble in
> outputting the text in an apropriate way.
>
> Problem is that if there is more than one word I cant handle the text
> cropping.
>
> For example:
> Search term: php germany
> Text from database: There is no such great language than php. Amongh those
> countries using this language is Germany with a good percentage of users.
> Text output should be:
> ...language than php. Amongh... language is Germay with a good...
>
> Similar to the way google does it. I tried it now with a couple of ways
> but
> failed for most (I tried with strpos and substr).
>
> Is there a solution out of the box with php, or maybe anybody knows a good
> script which does that. This does sound like a standard feature to me.

Here's a quickie, untested, and probably with some kind of logic errors,
or at least things not quite what you want.

$fulltext = "There is no such great language than php. Amongh those
countries using this language is Germany with a good percentage of
users.";
$words = explode(" ", "php germany");
$snippets = '';
while (list(, $word) = each($words)){
if (!stristr($snippets, $word)){ //skip this if we already got the word.
$start = strpos($fulltext, $word);
if ($start !== false){
$end = $start + strlen($word);
$jumpback = strpos(' ', $fulltext, $start - 20);
$jumpforward = strpos(' ', $fulltext, $end + 20);
$snippet = substr($fulltext, $jumpback, $jumpforward);
$snippets .= " $snippet ";
}
}
}
reset($words);
while (, $word) = each($words)){
$snippets = str_replacei($word, "<b>$word</b>", $snippets);
}
echo $snippets;


To Do:

Might wanna store an array of start/end numbers for snippets, then sort by
start, then combine those that "overlap" one end to the next start, *THEN*
combine those snippets, so you don't have snippets out or order, nor
overlapping.

Still, I got ya started...


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