大约有 35,700 项符合查询结果（耗时：0.0482秒） [XML]
?: operator (the 'Elvis operator') in PHP
...will leave foo unchanged.
Some more examples:
<?php
var_dump(5 ?: 0); // 5
var_dump(false ?: 0); // 0
var_dump(null ?: 'foo'); // 'foo'
var_dump(true ?: 123); // true
var_dump('rock' ?: 'roll'); // 'rock'
?>
By the way, it's called the Elvis operator.
...
How to loop through all but the last item of a list?
...
answered May 27 '09 at 9:04
freespacefreespace
15.1k33 gold badges3434 silver badges5555 bronze badges
...
Transitions on the CSS display property
...rder: 1px solid #eee;
}
div > ul {
visibility: hidden;
opacity: 0;
transition: visibility 0s, opacity 0.5s linear;
}
div:hover > ul {
visibility: visible;
opacity: 1;
}
<div>
<ul>
<li>Item 1</li>
<li>Item 2</li>
<li&...
Capture key press (or keydown) event on DIV element
...
302
(1) Set the tabindex attribute:
<div id="mydiv" tabindex="0" />
(2) Bind to keydown:
...
How does a UILabel's minimumScaleFactor work?
...
205
You need to set the label.adjustsFontSizeToFitWidth = YES;
...
Given an RGB value, how do I create a tint (or shade)?
Given an RGB value, like 168, 0, 255 , how do I create tints (make it lighter) and shades (make it darker) of the color?
3...
Check that an email address is valid on iOS [duplicate]
...ng
{
BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
NSString *stricterFilterString = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}$";
NSString *laxString = @"^.+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*$";
NSString *ema...
SQL Server 2008 Windows Auth Login Error: The login is from an untrusted domain
When attempting to connect to a SQL Server 2008 Instance using Management Studio, I get the following error:
35 Answers
...
Convert RGBA PNG to RGB with PIL
...
130
Here's a version that's much simpler - not sure how performant it is. Heavily based on some djan...
Definition of a Balanced Tree
...|
edited Feb 5 '13 at 16:50
answered Feb 5 '13 at 16:30
com...