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Consider I have a text of 300-400 words with some basic html. Example:

<p>text text word1 text text text filament text text text text text text text text</p> <p>text text text text text text text text text text text text text text text</p>

And I have a list of keyphrase with their urls associated (about 1000 records)

word1 word2 => 'url' house home => 'url1' flower filament => 'url2'

I need to place the url for the corrispondent word found in text. Example:

<p>text text <a href="url">word1</a> text [etc..]

I Know I can use a simple str_replace or preg_replace. But i dont' want to add to many links. Out of 300-400 words i don't want to put more than 5-6 links.

What can I Do?

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  • By what criteria would you limit it to 5-6 links? Commented Feb 13, 2011 at 20:47
  • @pekka you are stalking me with these questions :D Commented Feb 13, 2011 at 22:06
  • how do you mean this exactly? Please add more context and detail. :P Commented Feb 13, 2011 at 22:12

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use preg_replace() with the limit parameter, of course it will be the first X replacements, which may or may not be what you want

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A small example that justs makes the first instance of each desired word bold. Should be easy to do other stuff with it as well. :)

<? // Your text $s = <<<YourText <p>text text word1 text text text filament text text text text text text text text</p> <p>text text text text text text text text text text text text text text text</p> YourText; // The words you want to highlight $linkwords = array('text', 'word1', 'filament'); // Split the string by using spaces $words = explode(' ', $s); print_r($words); // Words you have highlighted already. $done = array(); // Loop through all words by reference foreach ($words as &$word) { // Highlight this word? if (array_search($word, $linkwords) !== false) { // Highlighted before? if (array_search($word, $done) === false) { // Remember it.. $done[] = substr($word,0); // And highlight it. $word = '<b>'.$word.'</b>'; } } } echo implode(' ', $words);
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First, from your question I figured that words/links ratio would be around 60. So, to give you an example, do the following:

define('WLRATIO', 60); $mytext = "text text ..... "; // Rough estimation of word count $links = count(explode(' ', $mytext)) / WLRATIO; $keywords = array( 'foo' => 'url1', 'bar' => 'url2' ... ); $keys = array_keys($keys); while ( $links-- ) { $n = rand(0, count($keys)-1); $mytext = preg_replace('/'+$keys[$n]+'/', '<a href="'+$keywords[$keys[$n]]+'">'+$keys[$n]+'</a>', $mytext, 1); } echo $mytext;
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