php ubb转换成html,html转换成ubb代码

function htmlToUBB($str)
{
$str = preg_replace("/]+src="([^"]+)"[^>]*>/i","[img]$1[/img]",$str);

$str = preg_replace("/]+src="([^"]+)"[^>]*>/i","[video]$1[/video]",$str);

return $str;
}

function UBB($str)
{
$auto_arr = array(
"/(?<=[^]a-z0-9-="'\/])((https?|ftp|mms|rtsp)://)([a-z0-9/-_+=.~!%@?#%&;:$\│]+)/i",
"/(?<=[^]a-z0-9/-_.~?=:.])([_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,4}))/i",
"/[img](.+?)[/img]/is",
"/[video](.+?)[/video]/is"
);

$auto_url = array(
'\1\3',
'\0',
'',
''
);

$str = preg_replace($auto_arr,$auto_url," ".$str);

$str = nl2br($str);

return $str;
}