PHP Curly括号，这段代码的含义 [英] PHP Curly bracket, what's meaning in this code

问题描述

我有以下代码(要从数据库中获取查询，请参见 MyBB 源代码):

I have this code (for getting a query from database, in MyBB source):

$query = "SELECT ".$fields." FROM {$this->table_prefix}{$table}";

我的问题是:{$table}是什么意思? $ table和{$table}({}是什么意思)之间有什么区别?

My question is: What's meaning of {$table}? and what the difference between $table and {$table} (what's meaning of {})??

谢谢...

推荐答案

花括号只是将变量名与文本的其余部分(以及其他变量名)隔离.通常，出于一致性考虑，使用此语法.当您的变量会碰到其他字母时，有时是有必要的，但是许多程序员一直在使用它，这样他们就不必思考是否有必要.

The braces simply sequester the variable names from the rest of the text (and other variable names). Generally, this syntax is used for consistency's sake; it's sometimes necessary when you have variables that run into other letters, but many programmers use it all the time so that they never have to think about whether it's necessary.

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