我如何在PHP中的字符串中定义常量？

Question

我正在使用常量NEWS_POST_NUMBER，我对如何将其附加到字符串以将其查询到数据库感到困惑。我尝试了很多东西而且是错误的。

这是我试过的字符串。

$query = "
SELECT news.id, news.timestamp, news.title 
FROM news 
ORDER BY id DESC 
LIMIT $from, NEWS_POST_NUMBER";

请注意NEWS_POST_NUMBER是我定义的常量我想附加它以查询我该怎么做？

Answer 1

$query = "SELECT news.id, news.timestamp, news.title FROM news ORDER BY id DESC LIMIT $from, " . NEWS_POST_NUMBER;

使用concatenation operator;）

Answer 2

$query = "
SELECT news.id, news.timestamp, news.title 
FROM news 
ORDER BY id DESC 
LIMIT $from, " . NEWS_POST_NUMBER;