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Check if PHP session has already started
...destroy();
session_id(); // returns empty string, ok, but then
session_id('foo'); // tell php the session id to use
session_id(); // returns 'foo', but no session is active.
So, prior to PHP 5.4 you should set a global boolean.
...
What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
... undecorated, but still adorned, version of the name. For a method named "foo", gcc will give you "foo", VC will give "my_namespace::my_class::foo".
– Adrian McCarthy
Jul 1 '15 at 15:56
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Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat
...a module from a module dependency: You have to turn your compile project(':foo') into compile(project(':foo')) { exclude module: 'support-v4' }. Note the parenthesis.
– espinchi
Nov 22 '14 at 17:28
...
GIT commit as different user without email / or only email
...
name family
Set a Git email:
$ git config --global user.email email@foo.com
Confirm that you have set the Git email correctly:
$ git config --global user.email
email@foo.com
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imp...
Pass a data.frame column name to a function
...ock here is that a natural (but incorrect) attempt often looks like this:
foo <- function(df,col_name,col1,col2){
df$col_name <- df$col1 + df$col2
df
}
#Call foo() like this:
foo(dat,z,x,y)
The problem here is that df$col1 doesn't evaluate the expression col1. It simply loo...
Get name of property as a string
...eClass
{
public static string SomeProperty
{
get { return "Foo"; }
}
}
public class RemoteMgr
{
public static void ExposeProperty<T>(Expression<Func<T>> property)
{
var expression = GetMemberInfo(property);
string path = string.Concat(ex...
git command to move a folder inside another
...ails with error
fatal: bad source, source=oldFolderName/somepath/somefile.foo, destination=newFolderName/somepath/somefile.foo
if there are any unadded files, so I just found out.
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Is there a Unix utility to prepend timestamps to stdin?
... line of input you give it. You can format it using strftime too.
$ echo 'foo bar baz' | ts
Mar 21 18:07:28 foo bar baz
$ echo 'blah blah blah' | ts '%F %T'
2012-03-21 18:07:30 blah blah blah
$
To install it:
sudo apt-get install moreutils
...
Understanding __get__ and __set__ and Python descriptors
...an be used to programmatically manage the results of a dotted lookup (e.g. foo.descriptor) in a normal expression, an assignment, and even a deletion.
Functions/methods, bound methods, property, classmethod, and staticmethod all use these special methods to control how they are accessed via the do...
How to detect the physical connected state of a network cable/connector?
...and "cable out" to stdout (assuming the interface is already up):
process foo {
# Wait for device to appear and be configured by udev.
net.backend.waitdevice("eth0");
# Wait for cable to be plugged in.
net.backend.waitlink("eth0");
# Print "cable in" when we reach this point, an...