Código PHP:
<?
function ReemplazarSmiles($texto){
$carpeta = "/img/smiles";
$smiles = array(
":)"=>"risa.gif",
":("=>"triste.gif",
);
foreach($smiles as $a => $b){
$texto = str_replace($a,"<img src="$carpeta/$b" width="15" height="15">",$texto) ;
}
return $texto ;
}
?>