HIGHLIGHT SPECIFIC WORDS IN A PHRASE
function highlight($sString, $aWords) {
if (!is_array ($aWords) || empty ($aWords) || !is_string ($sString)) {
return false;
}
$sWords = implode ('|', $aWords);
return preg_replace ('@\b('.$sWords.')\b@si', '<strong style="background-color:yellow">$1</strong>', $sString);
}