de'BBCODE'er

gistfile1.php

<?php 
function bbdecoder($bbcode){
	/* Match url */
	$urlmatch = "([a-zA-Z]+[:\/\/]+[A-Za-z0-9\-_:]+\\.+[A-Za-z0-9\.\/%&=\?\-_:]+)";

	/* Basically remove HTML tag's functionality */
	$bbcode = htmlspecialchars($bbcode);

	/* Bold text */
	$match["b"] = "/\[b\](.*?)\[\/b\]/is";
	$replace["b"] = "<span style=\"font-weight:bold;\">$1</span>";

	/* Italics */
	$match["i"] = "/\[i\](.*?)\[\/i\]/is";
	$replace["i"] = "<i>$1</i>";

	/* Underline */
	$match["u"] = "/\[u\](.*?)\[\/u\]/is";
	$replace["u"] = "<span style=\"text-decoration: underline\">$1</span>";

	/* Typewriter text */
	$match["tt"] = "/\[tt\](.*?)\[\/tt\]/is";
	$replace["tt"] = "<span style=\"font-family:monospace;\">$1</span>";

	$match["ttext"] = "/\[ttext\](.*?)\[\/ttext\]/is";
	$replace["ttext"] = "<span style=\"font-family:monospace;\">$1</span>";

	/* Strikethrough text */
	$match["s"] = "/\[s\](.*?)\[\/s\]/is";
	$replace["s"] = "<span style=\"text-decoration: line-through;\">$1</span>";
	$match["strike"] = "/\[strike\](.*?)\[\/strike\]/is";
	$replace["strike"] = "<span style=\"text-decoration: line-through;\">$1</span>";

	/* Color (or Colour) */
	$match["color"] = "/\[color=([a-zA-Z]+|#[a-fA-F0-9]{3}[a-fA-F0-9]{0,3})\](.*?)\[\/color\]/is";
	$replace["color"] = "<span style=\"color: $1\">$2</span>";

	$match["colour"] = "/\[colour=([a-zA-Z]+|#[a-fA-F0-9]{3}[a-fA-F0-9]{0,3})\](.*?)\[\/colour\]/is";
	$replace["colour"] = $replace["color"];

	/* Size */
	$match["size"] = "/\[size=([0-9]+(%|px|em)?)\](.*?)\[\/size\]/is";
	$replace["size"] = "<span style=\"font-size: $1;\">$3</span>";

	/* Images */
	$match["img"] = "/\[img\]".$urlmatch."\[\/img\]/is";
	$replace["img"] = "<img src=\"$1\" style=\"max-width:300px;\"/>";

	/* Links */
	$match["url"] = "/\[url=".$urlmatch."\](.*?)\[\/url\]/is";
	$replace["url"] = "<a href=\"$1\">$2</a>";

	$match["surl"] = "/\[url\]".$urlmatch."\[\/url\]/is";
	$replace["surl"] = "<a href=\"$1\">$1</a>";

	/* Quotes */
	$match["quote"] = "/\[quote\](.*?)\[\/quote\]/ism";
	$replace["quote"] = "<blockquote>$1</blockquote>";

	/* Parse */
	$bbcode = preg_replace($match, $replace, $bbcode);

	/* New line to <br> tag */
	$bbcode = nl2br($bbcode);

	/* Return */
	return $bbcode;
}
?>