问替换字符串中任何括号括起来的单词的所有ocurrence

EN

$string = "John Roberts is a jazz musician from Florida born in 1934. Some of his notable works include [A Gray Sky] and [Sophomore Effort].";

function rep_callback($match)
{
        $query = substr($match[0],1,-1);
        $query = urlencode($query);
        $link = '<a href="search.php?search='.$query.'">'.$match[0].'</a>';
        return $link;
}

echo $string."\n";
echo preg_replace_callback("/\[.+\]/U", "rep_callback", $string)."\n";

John Roberts is a jazz musician from Florida born in 1934. Some of his notable works include [A Gray Sky] and [Sophomore Effort].
John Roberts is a jazz musician from Florida born in 1934. Some of his notable works include <a href="search.php?search=A+Gray+Sky">[A Gray Sky]</a> and <a href="search.php?search=Sophomore+Effort">[Sophomore Effort]</a>.