大约有 19,000 项符合查询结果（耗时：0.0376秒） [XML]
How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”?
...
PHP 7+
As of PHP 7, this task can be performed simply by using the Null coalescing operator like this :
echo !empty($address['street2']) ?? 'Empty';
share
|
impro...
What exactly are DLL files, and how do they work?
...ntation of shared libraries.
DLLs are so much like an EXE that the file format itself is the same. Both EXE and DLLs are based on the Portable Executable (PE) file format. DLLs can also contain COM components and .NET libraries.
What does a DLL contain?
A DLL contains functions, classes, vari...
How to validate a url in Python? (Malformed or not)
...
This will not work for IPv6 urls, which have the form http://[2001:0DB8::3]:8080/index.php?valid=true#result
– cimnine
Feb 4 '18 at 20:42
...
Virtual Serial Port for Linux
...o do what you want, using Unix PTY's. It transmits the serial data in "raw form" to a network socket; STTY-like setup of terminal parameters must be done when creating the port, changing them later like described in RFC 2217 does not seem to be supported. You should be able to run two remserial inst...
jQuery UI dialog positioning
... Darn, that's nice but it's deprecated- "Note: The String and Array forms are deprecated." api.jqueryui.com/dialog/#option-position So you'd need to use the position object my/at/of thingy. See the link there about "jQuery UI Position". You could get something like position: { my: "center t...
When should I use cross apply over inner join?
...INNER JOIN will work as well?
See the article in my blog for detailed performance comparison:
INNER JOIN vs. CROSS APPLY
CROSS APPLY works better on things that have no simple JOIN condition.
This one selects 3 last records from t2 for each record from t1:
SELECT t1.*, t2o.*
FROM t1
CROS...
HTTP test server accepting GET/POST requests
I need a live test server that accepts my requests for basic information via HTTP GET and also allows me to POST (even if it's really not doing anything). This is entirely for test purposes.
...
How to cast int to enum in C++?
... @Mitch what do I get for using auto in this case? Is there any performance improvements?
– Frederico Pantuzza
May 19 '17 at 3:29
3
...
How do I auto-submit an upload form when a file is selected?
I have a simple file upload form. How do I make it submit automatically when a file has been selected? I don't want the user to have to click the Submit button.
...
How to get value from form field in django framework?
How do I get values from form fields in the django framework? I want to do this in views, not in templates...
5 Answers
...