I hope this sufficiently explains concatenation in general, how it relates to PHP, and my experience with using this basic operator.

我希望这些能够充分的解释连接操作符的基本概念和在PHP里的作用，以及我对这个基本操作的经验。

youdao

By using the approach of basic operator theory, a left multiplicative perturbation theorem of Cregularized resolvent families is proved.

应用算子理论方法，给出了一个C -正则预解族的左乘积扰动定理。

youdao

In Uganda, where villages often have one top-up phone run by a trusted operator, a basic system helps store and transfer money.

在乌干达，每个村庄有一个充值电话，由可信的接线员管理，这一基本系统帮助人们存款或转帐。

youdao

The Boxee blog voiced its approval of those strings, which basically amounts to a requirement that when an operator encrypts, it also needs to make basic channels accessible via IP -- with or without some hardware in your home -- so that Boxee and others can still tune in.

ENGADGET: FCC to allow encryption of basic cable, with a few strings that Boxee approves of

Theme park operator Six Flags, comparatively, uses a more basic and common tactic to distract guests.

FORBES: Professional Line Talkers And Flash Mobs Coming Soon To A Queue Near You

But the rail operator said the station "still lacks some very basic customer facilities", including a shelter and information screens.

BBC: Cosford railway station reopening delayed again