大约有 34,900 项符合查询结果（耗时：0.0554秒） [XML]
Get first n characters of a string
...tring = substr($string,0,10).'...';
Update:
Based on suggestion for checking length (and also ensuring similar lengths on trimmed and untrimmed strings):
$string = (strlen($string) > 13) ? substr($string,0,10).'...' : $string;
So you will get a string of max 13 characters; either 13 (or les...
OpenSSL and error in reading openssl.conf file
... from the commandline you can type:
set OPENSSL_CONF=c:/libs/openssl-0.9.8k/openssl.cnf
to validate it you can type:
echo %OPENSSL_CONF%
You can also set it as part of the computer's environmental variables so all users and services have it available by default. See, for example, Environment v...
How do I change the working directory in Python?
cd is the shell command to change the working directory.
14 Answers
14
...
The 'json' native gem requires installed build tools
...
I believe those installers make changes to the path. Did you try closing and re-opening the CMD window after running them and before the last attempt to install the gem that wants devkit present?
Also, be sure you are using the right devkit installer ...
If my interface must return Task what is the best way to have a no-operation implementation?
...the code below, due to the interface, the class LazyBar must return a task from its method (and for argument's sake can't be changed). If LazyBar s implementation is unusual in that it happens to run quickly and synchronously - what is the best way to return a No-Operation task from the method?
...
disable nganimate for some elements
...this to your CSS. It is best if it is the last rule:
.no-animate {
-webkit-transition: none !important;
transition: none !important;
}
then add no-animate to the class of element you want to disable. Example:
<div class="no-animate"></div>
...
Reading CSV file and storing values into an array
...
You can do it like this:
using System.IO;
static void Main(string[] args)
{
using(var reader = new StreamReader(@"C:\test.csv"))
{
List<string> listA = new List<string>();
List<string> listB = new ...
What exactly is metaprogramming?
...
Metaprogramming refers to a variety of ways a program has knowledge of itself or can manipulate itself.
In languages like C#, reflection is a form of metaprogramming since the program can examine information about itself. For example returning a list of all the properties of an obj...
Check for changes to an SQL Server table?
...
Take a look at the CHECKSUM command:
SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM sample_table WITH (NOLOCK);
That will return the same number each time it's run as long as the table contents haven't changed. See my post on ...
What's the advantage of Logic-less template (such as mustache)?
...n the foot. In the old JSP days, it was very common to have JSP files sprinkled with Java code, which made refactoring much harder, since you had your code scattered.
If you prevent logic in templates by design (like mustache does), you will be obliged to put the logic elsewhere, so your templates ...