php - {} 如何影响 PHP 中的 MySQL 查询？

Question

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Answer 1

在 SQL 方面，绝对没有区别:两个查询完全相同。
(您可以通过回显它们来检查)

{$variable} 是 $variable 的一种更完整的语法，它允许使用:

• "这是一些 {$variable}s"
• "{$object->data}"
• "{$array['data']}"
• "{$array['data']->obj->plop['test']}"

如需更多信息，请阅读 Variable parsing / Complex (curly) syntax手册的部分(引用一些位):

This isn't called complex because the syntax is complex, but because it allows for the use of complex expressions.

Any scalar variable, array element or object property with a string representation can be included via this syntax.
Simply write the expression the same way as it would appear outside the string, and then wrap it in { and }.