$lft = 111;$rgt = 222;
$sql = 'SELECT * FROM team WHERE lft BETWEEN {$lft} AND {$rgt}';
echo $sql; 原样输出：SELECT * FROM team WHERE lft BETWEEN {$lft} AND {$rgt}$lft = 111;$rgt = 222;
$sql = "SELECT * FROM team WHERE lft BETWEEN {$lft} AND {$rgt}";
echo $sql; 自动替换了：SELECT * FROM team WHERE lft BETWEEN 111 AND 222省老心了，无意发现的，大神勿喷啊。
最佳答案
