Cuting a string from a word?? how?

raverboy

Hello all..
I had done a web site what is dedicated to providie news, with a search engine what's give you the title of article and after you clik on it you wil have the article with searched word hilighted, next i what in the results to put a phrase cointining the keyword. I had tryed with strpos and substr, but is casesensitive, also stripos is not a good advice becose is for php5, anyway I desperatly need some help..

PS. i also tryed with explode (" ",$string)and than work with array bbeing easy to find the position in array of keword and then to extract a few words form left and a few from right is a solotion but is too slow.😉

more exactly i whant to have the result google like.

many thanks

python_q

Since str_replace is case-sensitive, and str_ireplace is PHP5, so those are out of the question. You could use preg_replace, and make it case-insensitive. You simply add (?i) to the beginning of the pattern. For example:


<?
$body = "This is a test, WORD wOrd WoRd.";
$search_term = "word";
$output = preg_replace("/(?i)$search_term/","<font class=hilite>$0</font>",$body);
echo $output;
?>

This script should work. Just change the "<font class=hilite>" to whatever you're using to create the highlight effect. The '$0' is a special variable which contains the word that matches the pattern. If for some reason it doesn't work, you can use '\0' instead. BTW, the only way I got this to work properly was to place the (?i) before the search pattern, otherwise, it remains case-sensitive.

raverboy

Thanks for replay, but, maybe from my english, you didn't understand exactly what my problem is. This with hightlight is done i used eregi_replace, works fine. But, for example, i have a news with more than 400 words, what i whant is to choose one ocurrance sf the keyword an take it with a few words around it and display it under the link.
Example: if i'm searching with the keyword "more" in the following text,

See Forum Rules (below) for more information about what
codes you are allowed to use in your posts.

the result to be something like:

...Rules (below) for more information about what ..

I repet not highliting is my problem... choping the string is my problem 🙁

python_q

After re-reading your original post, I realize my mistake. Anyway, I'm sure there's a simple way to do it. I'm testing some code right now. I'll see what I can come up with.

raverboy

I found a way, thanks pyton_q you give me the ideea with (?i).
Anyway for others who whant to do this, this is the solution.

function cut_and_hilight($string,$keyword){
    //colors for hilghtlight 
    $start_tag = "<span style='background-color: yellow'>";
    $end_tag = "</span>";
    //making the html code for hilight part of string
    $colorat = $start_tag.$keyword.$end_tag;
    //finding the position of keyword in the big string
    //strpos is case-sensitive so we use strtolower for both 
    //strings to convert them to lower case
    $pos = strpos(strtolower($string),strtolower($keyword));
     //here we are cuting the initial string from 
    //$pos-60 means from where to cut, position of keyword  -60 chars and 120 how long the generated string to bee in chars
    $cut = substr($string, $pos-60,120);
//return sends results aout of function
    return eregi_replace($keyword, $colorat, $cut);
}

python_q

That's a good start, but two things: it matches any occurance of $keyword, even if it is part of a word. If this isn't an issue, than you're good.

However, one bigger problem is if $keyword is before the 60th character in $string, then it'll cut out the end of the string, not the part you want. One workaround is to change:

    $cut = substr($string, $pos-60,120);

to:

    if ($pos>60) {
       $cut = substr($string, $pos-60,120);
    } else {
       $cut = substr($string, 0, 90);
    }

This should work fine now.

raverboy

Yes, you are right, are many problems to fix & upgrade in this code, but i have a starting point. 😃