Troubles caused by http_build_query function

http_build_query is a function used to generate URL request strings. It is very simple. However, there was a little accident today. When installing the company community on this machine, I was unable to log in. But the test server was normal. After carpet troubleshooting, Wrong, found the problem code (demo only, sensitive content is blocked):
[coolcode lang="php"]
$Args = array(
"usr" => "touchboy",
"pwd" => "123456" ,
"ip" => "127.0.0.1",
"src" => "account"
);
$query= http_build_query( $Args );

[/coolcode]
The result of the test server is:
usr=touchboy&pwd=123456&ip=127.0.0.1&src=account
And my local result is:
usr=touchboy &pwd=123456 &ip=127.0.0.1 &src=account
There is a difference in the connector in the middle, the server is normal”& ", but in my local machine it was an escaped "&", which ultimately led to an error in locally submitted data.
Checking the PHP manual in hand, the http_build_query section did not mention this problem. So the only remedy that came to mind was to use htmlspecialchars_decode( $query) to restore the connector. However, I always felt suspicious as to why the results on the two machines were different. I started to suspect that it was the difference between Linux (server) and Windows (local machine), but after testing on another Windows machine, the results were normal. Later, I suspected that it was a problem with the environment configuration. After some google, the truth came out. The culprit of the problem was a line in the php.ini configuration:
[coolcode lang="php"]arg_separator.output = "&"[/coolcode]
will arg_separator.output is defined as "&", restart apache, the problem is solved!
By the way, let me talk about the problem of the PHP manual, because the manual I used is the classic "PHP5 Chinese Manual Documentation Version" (compiled on 2006-11-05). The content of Dongdong 2 and a half years ago should stay at the PHP 5.1.0 stage. Many contents have lagged behind. Then I downloaded Chen Hao (Haohappy)'s "PHP Chinese Manual" (compiled on 2009-02-15) and checked http_build_query In one section, I found a line of related prompts:
[coolcode lang="php"]
Note: Use arg_separator.output to separate parameters. [/coolcode]
Go to the official manual to check the latest manual, and find that there is a more detailed explanation, indicating that the $arg_separator parameter has been added in version 5.1.2 to solve this problem. It seems that the Chinese manual is still very lagging, and 5.1.2 should be a It was released years ago, but the latest Chinese manual compiled on 2009-02-15 still does not include relevant content.
In short, the best solution to save time when encountering PHP function failure:
1. Go to PHP as soon as possible Find the official answer.
2. Make sure the PHP manual in your hand is up to date.

The above has introduced the troubles caused by the http_build_query function, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.