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Check whether an array is empty [duplicate]
...in array and this definitely doesn't mean that array is empty. As a quick workaround you can do following:
$errors = array_filter($errors);
if (!empty($errors)) {
}
array_filter() function's default behavior will remove all values from array which are equal to null, 0, '' or false.
Otherwise in...
Android Studio: Android Manifest doesn't exists or has incorrect root tag
I got this error on Android Studio (AS):
11 Answers
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Why use String.Format? [duplicate]
Why would anyone use String.Format in C# and VB .NET as opposed to the concatenation operators ( & in VB, and + in C#)?
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Git clone particular version of remote repository
I cloned a remote git repository about a month ago. The remote repository has undergone many changes and has now become unstable. Now I need another copy of the repository, version identical to the one I cloned a month ago.
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Java: Static vs inner class [duplicate]
...esting instance, so a static nested class cannot invoke non-static methods or access non-static fields of an instance of the class within which it is nested.
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What is the difference between a WCF Service Application and a WCF Service Library?
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A service application includes a website host already setup for you. A service library is a library of services that a host can reference and startup.
If you start with a service library (recommended) you can then choose any host you wish (a windows service, IIS/ASP.NET, or even a co...
What is the relationship between the docker host OS and the container base image OS?
...at I can get my hands on I see that I can install Docker on Ubuntu 12.04 (for example) and then I can install a Fedora container or a different version of ubuntu? (there is an example where the user installed busybox in the container.)
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What's the difference between & and && in MATLAB?
What is the difference between the & and && logical operators in MATLAB?
7 Answers
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What characters are allowed in an email address?
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See RFC 5322: Internet Message Format and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol.
RFC 822 also covers email addresses, but it deals mostly with its structure:
addr-spec = local-part "@" domain ; global address
local-...
Why is char[] preferred over String for passwords?
In Swing, the password field has a getPassword() (returns char[] ) method instead of the usual getText() (returns String ) method. Similarly, I have come across a suggestion not to use String to handle passwords.
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