Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there)
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// BBcode 2 HTML was written by
// extended to work with Mistpark/Friendika - Mike Macgirvin
function bbcode($Text) {
// Replace any html brackets with HTML Entities to prevent executing HTML or script
// Don't use strip_tags here because it breaks [url] search by replacing & with amp
$Text = str_replace("<", "&lt;", $Text);
$Text = str_replace(">", "&gt;", $Text);
// Convert new line chars to html <br /> tags
$Text = nl2br($Text);
// Set up the parameters for a URL search string
$URLSearchString = " a-zA-Z0-9\:\/\-\?\&\.\=\_\~\#\'\%";
// Set up the parameters for a MAIL search string
$MAILSearchString = $URLSearchString . " a-zA-Z0-9\.@";
// Perform URL Search
$Text = preg_replace("/([^\]\=]|^)(https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\.\=\_\~\#\'\%]+)/", ' <a href="$2" target="external-link">$2</a>', $Text);
$Text = preg_replace("/\[url\]([$URLSearchString]*)\[\/url\]/", '<a href="$1" target="external-link">$1</a>', $Text);
$Text = preg_replace("(\[url\=([$URLSearchString]*)\](.+?)\[/url\])", '<a href="$1" target="external-link">$2</a>', $Text);
//$Text = preg_replace("(\[url\=([$URLSearchString]*)\]([$URLSearchString]*)\[/url\])", '<a href="$1" target="_blank">$2</a>', $Text);
// Perform MAIL Search
$Text = preg_replace("(\[mail\]([$MAILSearchString]*)\[/mail\])", '<a href="mailto:$1">$1</a>', $Text);
$Text = preg_replace("/\[mail\=([$MAILSearchString]*)\](.+?)\[\/mail\]/", '<a href="mailto:$1">$2</a>', $Text);
// Check for bold text
$Text = preg_replace("(\[b\](.+?)\[\/b])is",'<strong>$1</strong>',$Text);
// Check for Italics text
$Text = preg_replace("(\[i\](.+?)\[\/i\])is",'<em>$1</em>',$Text);
// Check for Underline text
$Text = preg_replace("(\[u\](.+?)\[\/u\])is",'<u>$1</u>',$Text);
// Check for strike-through text
$Text = preg_replace("(\[s\](.+?)\[\/s\])is",'<strike>$1</strike>',$Text);
// Check for over-line text
$Text = preg_replace("(\[o\](.+?)\[\/o\])is",'<span class="overline">$1</span>',$Text);
// Check for colored text
$Text = preg_replace("(\[color=(.+?)\](.+?)\[\/color\])is","<span style=\"color: $1\">$2</span>",$Text);
// Check for sized text
$Text = preg_replace("(\[size=(.+?)\](.+?)\[\/size\])is","<span style=\"font-size: $1px\">$2</span>",$Text);
// Check for list text
$Text = preg_replace("/\[list\](.+?)\[\/list\]/is", '<ul class="listbullet">$1</ul>' ,$Text);
$Text = preg_replace("/\[list=1\](.+?)\[\/list\]/is", '<ul class="listdecimal">$1</ul>' ,$Text);
$Text = preg_replace("/\[list=i\](.+?)\[\/list\]/s",'<ul class="listlowerroman">$1</ul>' ,$Text);
$Text = preg_replace("/\[list=I\](.+?)\[\/list\]/s", '<ul class="listupperroman">$1</ul>' ,$Text);
$Text = preg_replace("/\[list=a\](.+?)\[\/list\]/s", '<ul class="listloweralpha">$1</ul>' ,$Text);
$Text = preg_replace("/\[list=A\](.+?)\[\/list\]/s", '<ul class="listupperalpha">$1</ul>' ,$Text);
$Text = str_replace("[*]", "<li>", $Text);
// Check for font change text
$Text = preg_replace("(\[font=(.+?)\](.+?)\[\/font\])","<span style=\"font-family: $1;\">$2</span>",$Text);
// Declare the format for [code] layout
$CodeLayout = '<code>$1</code>';
// Check for [code] text
$Text = preg_replace("/\[code\](.+?)\[\/code\]/is","$CodeLayout", $Text);
// Declare the format for [quote] layout
$QuoteLayout = '<blockquote>$1</blockquote>';
// Check for [quote] text
$Text = preg_replace("/\[quote\](.+?)\[\/quote\]/is","$QuoteLayout", $Text);
// Images
// [img]pathtoimage[/img]
$Text = preg_replace("/\[img\](.+?)\[\/img\]/", '<img src="$1">', $Text);
// html5 video and audio
$Text = preg_replace("/\[video\](.+?)\[\/video\]/", '<video src="$1" controls="controls" width="425" height="350"><a href="$1">$1</a></video>', $Text);
$Text = preg_replace("/\[audio\](.+?)\[\/audio\]/", '<audio src="$1" controls="controls"><a href="$1">$1</a></audio>', $Text);
// [img=widthxheight]image source[/img]
$Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.+?)\[\/img\]/", '<img src="$3" height="$2" width="$1">', $Text);
// Youtube extensions
$Text = preg_replace("/\[youtube\]http:\/\/\/watch\?v\=(.+?)\[\/youtube\]/",'[youtube]$1[/youtube]',$Text);
$Text = preg_replace("/\[youtube\](.+?)\[\/youtube\]/", '<object width="425" height="350" type="application/x-shockwave-flash" data="$1" ><param name="movie" value="$1"></param><!--[if IE]><embed src="$1" type="application/x-shockwave-flash" width="425" height="350" /><![endif]--></object>', $Text);
// oembed tag
$Text = oembed_bbcode2html($Text);
return $Text;