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What does $1 [QSA,L] mean in my .htaccess file?

I need to change my .htaccess and there are two lines which I don't understand. 3 Answers ...
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Comma separator for numbers in R?

... This is a very late response, and it may have been true in the past that comma_format didn't handle real numbers but now you can do the following: scales::comma_format(digits = 12)(1000000.789) which results in the following: "1,000,000.789". ...
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Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?

... Short of closing and reopening your tty (i.e. logging off and back on, which may also terminate some of your background processes in the process) you only have one choice left: attach to the process in question using gdb, and run: p dup2(...
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Why is === faster than == in PHP?

...nverts, the data type temporarily to see if it’s equal to the other operand, whereas === (the identity operator) doesn’t need to do any converting whatsoever and thus less work is done, which makes it faster. share ...
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What is the equivalent of “!=” in Excel VBA?

... Fun fact to back this answer: Visual Basic and Pascal languages store strings with their length in the beginning and the content itself right after that. C-based and Java languages, on the other hand, do not store the length and have the '\0' (null) terminator to sign...
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Why is there no std::stou?

... pat answer would be that the C library has no corresponding “strtou”, and the C++11 string functions are all just thinly veiled wrappers around the C library functions: The std::sto* functions mirror strto*, and the std::to_string functions use sprintf. Edit: As KennyTM points out, both stoi...
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.append(), prepend(), .after() and .before()

I am pretty proficient with coding, but now and then I come across code that seems to do basically the same thing. My main question here is, why would you use .append() rather then .after() or vice verses? ...
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SQL Server ':setvar' Error

... The :setvar only works in SQL command mode, so you are possibly within normal SQL execution in the management studio and have not swapped to command mode. This can be done through the user interface in SQL Server Management Studio by going to the "Query" men...
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When should Flask.g be used?

...ting DB connections are tasks which setup the environment for the request, and should not be handled inside before_request and after_request) share | improve this answer | f...
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How to use a class from one C# project with another C# project

In the same solution, I have two projects: P1 and P2. How can I make use of a class of P1 in P2? 9 Answers ...