[emmanuel]

While performing a search, it's ofter very useful to highlight in different colors.

This function is useful to highlight words from a simple non-html text. For instance, the search results from your site can be highlighted.

<?php
// Credits: http://www.bitrepository.com/
function hightlight($str, $keywords = '')
{
$keywords = preg_replace('/\s\s+/', ' ', strip_tags(trim($keywords))); // filter

$style = 'highlight';
$style_i = 'highlight_important';

/* Apply Style */

$var = '';

foreach(explode(' ', $keywords) as $keyword)
{
$replacement = "<span class='".$style."'>".$keyword."</span>";
$var .= $replacement." ";

$str = str_ireplace($keyword, $replacement, $str);
}

/* Apply Important Style */

$str = str_ireplace(rtrim($var), "<span class='".$style_i."'>".$keywords."</span>", $str);

return $str;
}

Don’t forget to define your style in the same file or in a separate one (recommended)!

.highlight
{
background: #CEDAEB;
}

.highlight_important
{
background: #F8DCB8;
}

Very easy stuff, Happy Searching