ฟังก์ชั่น BBCode to HTML แปลง BBCode เป็น HTML

บางครั้งเราต้องการดึงรายละเอียดกระทู้มาแสดง แต่ปัญหาที่เจอคือมันจะมาทั้ง bbcode ด้วย เวลาแสดงผล html ก็ไม่รู้จักอีก

ดังนั้น ต้องมีฟังก์ชั่นในการแปลงให้ข้อความจาก bbcode กลับเข้าสู่ html ดั่งเดิม

function bbcode2html($message) {

$preg = array(
'/(?<!\\\\)\[color(?::\w+)?=(.*?)\](.*?)\[\/color(?::\w+)?\]/si' => "<span style=\"color:\\1\">\\2</span>",
'/(?<!\\\\)\[size(?::\w+)?=(.*?)\](.*?)\[\/size(?::\w+)?\]/si' => "<span style=\"font-size:\\1\">\\2</span>",
'/(?<!\\\\)\[font(?::\w+)?=(.*?)\](.*?)\[\/font(?::\w+)?\]/si' => "<span style=\"font-family:\\1\">\\2</span>",
'/(?<!\\\\)\[align(?::\w+)?=(.*?)\](.*?)\[\/align(?::\w+)?\]/si' => "<div style=\"text-align:\\1\">\\2</div>",
'/(?<!\\\\)\[b(?::\w+)?\](.*?)\[\/b(?::\w+)?\]/si' => "<span style=\"font-weight:bold\">\\1</span>",
'/(?<!\\\\)\[i(?::\w+)?\](.*?)\[\/i(?::\w+)?\]/si' => "<span style=\"font-style:italic\">\\1</span>",
'/(?<!\\\\)\[u(?::\w+)?\](.*?)\[\/u(?::\w+)?\]/si' => "<span style=\"text-decoration:underline\">\\1</span>",
'/(?<!\\\\)\[center(?::\w+)?\](.*?)\[\/center(?::\w+)?\]/si' => "<div style=\"text-align:center\">\\1</div>",

// [email]
'/(?<!\\\\)\[email(?::\w+)?\](.*?)\[\/email(?::\w+)?\]/si' => "<a href=\"mailto:\\1\" class=\"bb-email\">\\1</a>",
'/(?<!\\\\)\[email(?::\w+)?=(.*?)\](.*?)\[\/email(?::\w+)?\]/si' => "<a href=\"mailto:\\1\" class=\"bb-email\">\\2</a>",
// [url]
'/(?<!\\\\)\[url(?::\w+)?\]www\.(.*?)\[\/url(?::\w+)?\]/si' => "<a href=\"http://www.\\1\" target=\"_blank\" class=\"bb-url\">\\1</a>",
'/(?<!\\\\)\[url(?::\w+)?\](.*?)\[\/url(?::\w+)?\]/si' => "<a href=\"\\1\" target=\"_blank\" class=\"bb-url\">\\1</a>",
'/(?<!\\\\)\[url(?::\w+)?=(.*?)?\](.*?)\[\/url(?::\w+)?\]/si' => "<a href=\"\\1\" target=\"_blank\" class=\"bb-url\">\\2</a>",
// [img]
'/(?<!\\\\)\[img(?::\w+)?\](.*?)\[\/img(?::\w+)?\]/si' => "<img src=\"\\1\" alt=\"\\1\" class=\"bb-image\" />",
'/(?<!\\\\)\[img(?::\w+)?=(.*?)x(.*?)\](.*?)\[\/img(?::\w+)?\]/si' => "<img width=\"\\1\" height=\"\\2\" src=\"\\3\" alt=\"\\3\" class=\"bb-image\" />",

// [list]
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[\*(?::\w+)?\](.*?)(?=(?:\s*<br\s*\/?>\s*)?\[\*|(?:\s*<br\s*\/?>\s*)?\[\/?list)/si' => "\n<li class=\"bb-listitem\">\\1</li>",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[\/list(:(?!u|o)\w+)?\](?:<br\s*\/?>)?/si' => "\n</ul>",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[\/list:u(:\w+)?\](?:<br\s*\/?>)?/si' => "\n</ul>",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[\/list:o(:\w+)?\](?:<br\s*\/?>)?/si' => "\n</ol>",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(:(?!u|o)\w+)?\]\s*(?:<br\s*\/?>)?/si' => "\n<ul class=\"bb-list-unordered\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list:u(:\w+)?\]\s*(?:<br\s*\/?>)?/si' => "\n<ul class=\"bb-list-unordered\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list:o(:\w+)?\]\s*(?:<br\s*\/?>)?/si' => "\n<ol class=\"bb-list-ordered\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(?::o)?(:\w+)?=1\]\s*(?:<br\s*\/?>)?/si' => "\n<ol class=\"bb-list-ordered,bb-list-ordered-d\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(?::o)?(:\w+)?=i\]\s*(?:<br\s*\/?>)?/s' => "\n<ol class=\"bb-list-ordered,bb-list-ordered-lr\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(?::o)?(:\w+)?=I\]\s*(?:<br\s*\/?>)?/s' => "\n<ol class=\"bb-list-ordered,bb-list-ordered-ur\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(?::o)?(:\w+)?=a\]\s*(?:<br\s*\/?>)?/s' => "\n<ol class=\"bb-list-ordered,bb-list-ordered-la\">",
'/(?<!\\\\)(?:\s*<br\s*\/?>\s*)?\[list(?::o)?(:\w+)?=A\]\s*(?:<br\s*\/?>)?/s' => "\n<ol class=\"bb-list-ordered,bb-list-ordered-ua\">",

//line breaks
'/\n/' => "<br>",
// escaped tags like \[b], \[color], \[url], ...
'/\\\\(\[\/?\w+(?::\w+)*\])/' => "\\1"

);

$message = preg_replace(array_keys($preg), array_values($preg), $message);
return $message;
}

วิธีใช้
$body="ฉัน[b]รัก[/b]ประเทศไทย"
echo bbcode2html($body);

ผลลัพธ์

ฉัน<b>รัก</b>ประเทศไทย