PHP - replace text with smiley - php

Question

I have this function:
function bb_parse($string) {
$string = $this->quote($string);
$string=nl2br($string);
$string = html_entity_decode(stripslashes(stripslashes($string)));
$tags = 'b|i|u';
while (preg_match_all('`\[('.$tags.')=?(.*?)\](.+?)\[/\1\]`', $string, $matches)) foreach ($matches[0] as $key => $match) {
list($tag, $param, $innertext) = array($matches[1][$key], $matches[2][$key], $matches[3][$key]);
switch ($tag) {
case 'b': $replacement = "<strong>$innertext</strong>"; break;
case 'i': $replacement = "<em>$innertext</em>"; break;
case 'u': $replacement = "<u>$innertext</u>"; break;
}
$string = str_replace($match, $replacement, $string);
}
return $string;
}
As you can see, I can easily make BBCode with bold, italic and underline. Although, I am trying to add smileys to this function as well, but without luck.
I tried to simply just add :) to the $tags, and then add the smiley :) img in the case, but that did not work.
How can I do, so I can also add smilies to this?
Thanks in advance.

Answer 1

Just create a function that does a simple str_replace, I'd say:
<?php
function smilies( $text ) {
$smilies = array(
';)' => '<img src="wink.png" />',
':)' => '<img src="smile.png" />'
);
return str_replace( array_keys( $smilies ), array_values( $smilies ), $text );
}
$string = '[b]hello[/b] smile: :)';
echo smilies( bb_parse( $string ) );

Answer 2

http://php.net/manual/en/function.preg-quote.php
You have to escape your smiley tags.
$tags = 'b|i|u|'.preg_quote(":)");