ББ коды

/*
[type=1]текст[/type]
заменить на
<marquee behavior="alternate" direction="left" bgcolor="#ffcc00">текст</marquee>
---
[type=2]текст[/type]
заменить на
<marquee>текст</marquee>
---
[type=3]текст[/type]
заменить на
<td>текст</td>
*/

$str = '[type=1]текст[/type]';
//$str = '[type=2]текст[/type]';
//$str = '[type=3]текст[/type]';

$types = [
    'marquee behavior="alternate" direction="left" bgcolor="#ffcc00"',
    'marquee',
    'td',
];

$str = preg_replace_callback(
    '~\[type=(\d+)]([^[]+)\[/type]~',
    function($m) use($types){
        $key = $m[1];
        $txt = $m[2];
        if (isset($types[--$key])) {
            $left = $types[$key];
            $right = preg_replace("~(\S+).*~", '$1', $left);
            return "<$left>{$txt}</$right>";
        }
    },
    $str
);

echo $str;

$str = '[type=1]текст[/type]';

$types = [
    'marquee behavior="alternate" direction="left" bgcolor="#ffcc00"',
    'marquee',
    'td'
];

$str = preg_replace_callback(
    '~\[type=(\d+)]([^[]+)\[/type]~',
    function($m) use($types){
        $key = $m[1];
        $txt = $m[2];
        if (isset($types[--$key])) {
            $tag = $types[$key];
            $attr = '';
            if (strpos($tag, ' ')) {
                [$tag, $attr] = explode(' ', $tag, 2);
                $attr = " $attr";
            }
            return "<$tag{$attr}>{$txt}</$tag>";
        }
        return $m[0];
    },
    $str
);

echo $str;