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Swapping two variable value without using third variable
One of the very tricky questions asked in an interview.
27 Answers
27
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How do I implement a callback in PHP?
...cb(). call_user_func and call_user_func_array support all the above.
See: http://php.net/manual/en/language.types.callable.php
Notes/Caveats:
If the function/class is namespaced, the string must contain the fully-qualified name. E.g. ['Vendor\Package\Foo', 'method']
call_user_func does not supp...
Rails Migration: Remove constraint
...ke so
change_column :users, :address, :string, :null => true
Docs...
http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_column
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What are the security risks of setting Access-Control-Allow-Origin?
...e a request to use transient authentication in the form of cookies, cached HTTP authentication or client SSL certificates. However if the website were for example to use local storage for authentication, that would be a problem.
– Niklas B.
Aug 25 '14 at 23:29
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Select values from XML field in SQL Server 2008
Just looking at my XML field, my rows look like this:
9 Answers
9
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How to develop a soft keyboard for Android? [closed]
...tions:
An inputMethod is basically an Android Service, so yes, you can do HTTP and all the stuff you can do in a Service.
You can open Activities and dialogs from the InputMethod. Once again, it's just a Service.
I've been developing an IME, so ask again if you run into an issue.
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Is R's apply family more than syntactic sugar?
...regarding execution time and / or memory.
5 Answers
5
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Data Modeling with Kafka? Topics and Partitions
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
...;
listen [::]:80 ipv6only=on default_server;
For more information, see:
http://forum.linode.com/viewtopic.php?t=8580
http://wiki.nginx.org/HttpCoreModule#listen
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Default behavior of “git push” without a branch specified
...me name.
What has been discussed so far can be seen in this thread:
http://thread.gmane.org/gmane.comp.version-control.git/192547/focus=192694
Previous relevant discussions include:
http://thread.gmane.org/gmane.comp.version-control.git/123350/focus=123541
http://thread.gmane.org/gmane...