我可以在每个语句的多行中编写 PHP 代码吗？
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Can I write PHP code across multiple lines per statement?
提问by tim
Is it okay to write code like this, with statements spanning across multiple lines?
编写这样的代码，语句跨越多行可以吗？
$db_selected =
mysql_select_db(
'my_dbase',
mysql_connect(
'localhost',
'mysql_user',
'mysql_password'
)
);
In HTML, new lines are ignored, but in PHP I sometimes get errors. I'm not too familiar with PHP, but thought this should be just fine, no?
在 HTML 中，新行会被忽略，但在 PHP 中我有时会出错。我对 PHP 不太熟悉，但认为这应该没问题，不是吗？
回答by cwallenpoole
No, but not for why you think. The whitespace is fine, but there is an issue with that code:
不，但不是因为你为什么这么想。空格很好，但该代码存在问题：
mysql_select_db(
'my_dbase',
// don't call mysql_connect here!!!
mysql_connect(
'localhost',
'mysql_user',
'mysql_password'
)
);
MySQL connect will return FALSE on error. This means that you'll not be able to handle the mysql_error()there ANDit will cause an error in mysql_select_db.
MySQL 连接将在出错时返回 FALSE。这意味着您将无法处理mysql_error()那里，并且会导致mysql_select_db.
You're better off:
你最好：
$conn = mysql_connect(
'localhost',
'mysql_user',
'mysql_password'
) or die( mysql_error() );
mysql_select_db(
'my_dbase',
$conn // optional parameter, but useful nonetheless.
);
回答by tim
I'm gonna answer my own question: Simply tried this and on my LAMP server, the originally posted code snippet works just fine (php 5).
我要回答我自己的问题：简单地尝试这个，在我的 LAMP 服务器上，最初发布的代码片段工作得很好（php 5）。
So yes, you can separate statements including those with operators into multiple lines.
所以是的，您可以将包括带有运算符的语句在内的语句分成多行。
And the answer with the string concatenation - yes there are myriad answers on this forum already about that but I was asking about statements, not strings, which I could not find answered elsewhere.
和字符串连接的答案 - 是的，这个论坛上已经有无数关于这个的答案，但我问的是陈述，而不是字符串，我在其他地方找不到答案。
Thanks everyone! Especially Geroge Cummins.
谢谢大家！尤其是乔治·康明斯。
回答by Shaz
Yes it's okay, as long as there are no new lines after operators, such as =, in, ==, etc...
是的，这没关系，只要没有新线运营后，如=，in，==，等...
回答by George Cummins
Whitespace is generally ignored, so you can insert line breaks as needed. However, you need to end each statement with a semicolon (;).
空格通常会被忽略，因此您可以根据需要插入换行符。但是，您需要以分号 ( ;)结束每个语句。
回答by Brian Patterson
Yes, but for certain things, such as text I do something like ...
是的，但是对于某些事情，例如文本，我会做一些类似的事情......
$someText = " blah blah blah ".
"some more blah blah blah";
Hope this helps
希望这可以帮助
