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List comprehension: Returning two (or more) items for each item
Is it possible to return 2 (or more) items for each item in a list comprehension?
6 Answers
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What is 'Currying'?
...s into a series of functions that each take only one argument. Here's an example in JavaScript:
function add (a, b) {
return a + b;
}
add(3, 4); // returns 7
This is a function that takes two arguments, a and b, and returns their sum. We will now curry this function:
function add (a) {
re...
C++简练易用的线程池(threadpool)及上下文隔离的无锁线程池(isolated_threa...
... bind： .commit(std::bind(&Dog::sayHello, &dog));
// 一种是用 mem_fn： .commit(std::mem_fn(&Dog::sayHello), this)
template<class F, class... Args>
auto commit(F&& f, Args&&... args) ->future<decltype(f(args...))>
{
if (!_run)
throw runtime_error("commit on ThreadPool is stopped.")...
How to generate XML file dynamically using PHP?
...runtime. Please help me in generating the below XML file dynamically using PHP.
7 Answers
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How do I get the type of a variable?
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I totally disagree. Java, C#, PHP, Perl, Python and so on were designed in C and C++ and they are not caterpillars. (When you create an database application to open variable tables from 'unknown' databases you need to control field type to variable scheme...
PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?
...) can use prepared statements in the query cache. So your version of MySQL+PHP can use prepared statements with the query cache. However, make careful note of the caveats for caching query results in the MySQL documentation. There are many kinds of queries which cannot be cached or which are useless...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...efore removing the pidfile:
LOCKFILE=/tmp/lock.txt
if [ -e ${LOCKFILE} ] &amp;&amp; kill -0 `cat ${LOCKFILE}`; then
echo "already running"
exit
fi
# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ &gt; ${LOCKFILE}
# do ...
How can I convert ereg expressions to preg in PHP?
Since POSIX regular expressions (ereg) are deprecated since PHP 5.3.0, I'd like to know an easy way to convert the old expressions to PCRE (Perl Compatible Regular Expressions) (preg) .
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Access-Control-Allow-Origin Multiple Origin Domains?
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Another solution I'm using in PHP:
$http_origin = $_SERVER['HTTP_ORIGIN'];
if ($http_origin == "http://www.domain1.com" || $http_origin == "http://www.domain2.com" || $http_origin == "http://www.domain3.com")
{
header("Access-Control-Allow-Origin:...
Should I mix AngularJS with a PHP framework? [closed]
...l when it comes to interactive HTML5 and model binding. On the other hand, PHP frameworks like Yii enable quick, well-structured, safe and powerful web application development. Both technologies provide sophisticated means for data access, iteration and page layouting.
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