Php mysql查询的三元If语句

如何为$sql变量添加更多的三元if语句？当我尝试添加更多内容时，输出为空：

工作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "");

不工作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "")
        " . ($rating_filter == 1 ? " ORDER BY r.rating " : "");

---

您的查询中有输入错误，请尝试以下操作：

$sql = "SELECT r.title,r.author,r.summary,r.posted_on,r.review_url,r.rating 
        FROM reviews r 
        LEFT JOIN websites w 
        ON w.id=r.website_id 
        WHERE w.rooftop_id=$rooftop_id
        AND review_site_id IN ($sites)
        AND rating >= $star_threshold
        AND review_status_id=2
        " . ($pagination == 1 ? " LIMIT $offset, $review_limit " : "")
        . ($rating_filter == 1 ? " ORDER BY r.rating " : "");

---

就MySQL而言，

SELECT

语句中的

LIMIT

子句不能位于

orderby

子句之前。

ORDER BY

子句必须在

LIMIT

子句之前

---

---

php语法中有一个简单的问题，在您发布的最后一行代码的开头有一个额外的双引号。

查看您的引号。他们错了。打开错误报告！在

php.ini

中查找

error\u reporting

和

display\u errors

。