吐血分享一个 PHP 超级实用的技巧 [ 新手入门 ]

$lft = 111;$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。