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Posted by Merlin on 05/11/05 14:31
Richard Lynch wrote:
> 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...
>
>
Hi Richard,
thank you for the jump start! I have fixed some errors within the script and now
it works ( I am attaching the script). You are right, the overlap is a to do.
Best regards, Merlin
<?php
$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 (list(, $word) = each($words)){
$snippets = str_replace($word, "<b>$word</b>", $snippets);
}
echo $snippets;
?>
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