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Calculate number of hours between 2 dates in PHP
...= iterator_count($periods);
echo $hours . ' hours';
//difference between Unix Epoch
$diff = $end->getTimestamp() - $start->getTimestamp();
$hours = $diff / ( 60 * 60 );
echo $hours . ' hours (60 * 60)';
//difference between days
$diff = $end->diff($start);
$hours = $diff->h + ($diff-&...
JAVA线程池管理及分布式HADOOP调度框架搭建 - 人工智能(AI) - 清泛IT社区，...
...陷就是随着开发人员的增多和业务模型的增多，单线程的编程模型也会变得复杂。比如需要对1000w数据进行分词，如果这个放到一个线程里来执行，不算计算时间消耗光是查询数据库就需要耗费不少时间。有人说，那我把1000w数...
Is there replacement for cat on Windows
...
Windows type command works similarly to UNIX cat.
Example 1:
type file1 file2 > file3
is equivalent of:
cat file1 file2 > file3
Example 2:
type *.vcf > all_in_one.vcf
This command will merge all the vcards into one.
...
Differences between fork and exec
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The use of fork and exec exemplifies the spirit of UNIX in that it provides a very simple way to start new processes.
The fork call basically makes a duplicate of the current process, identical in almost every way. Not everything is copied over (for example, resource limits ...
Get current time as formatted string in Go?
...date in go (number of seconds from january 1970), the correct function is .Unix(), and it really return an integer
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Hidden Features of MySQL
...se types in a WHERE clause, it is best to do
WHERE datecolumn = FROM_UNIXTIME(1057941242)
and not
WHERE UNIX_TIMESTAMP(datecolumn) = 1057941242.
doing the latter won't take advantage of an index on that column.
http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html
UNIX...
127 Return code from $?
What is the meaning of return value 127 from $? in UNIX.
8 Answers
8
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What's the difference between [ and [[ in Bash? [duplicate]
...test)
works about the same as [ in all the other sh-based shells in many UNIX-like environments
only supports a single condition. Multiple tests with the bash && and || operators must be in separate brackets.
doesn't natively support a 'not' operator. To invert a condition, use a ! outs...
NOW() function in PHP
...y higher performance, but less usable for date/time manipulations
// From Unix timestamp
// Using date_create() with a Unix timestamp will give you a FALSE,
// and if you try to invoke format() on a FALSE then you'll get a:
// Fatal error: Call to a member function format() on boolean
// So...
File name? Path name? Base name? Naming standard for pieces of a path
...or Root Directory: Former is .NET convention while latter is more heard in UNIX circles. Though I like both I tend to use the former more. In windows, unlike UNIX, has many different root paths, one for each partition. Unix systems have one root directory which holds information on other directories...