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How to use PHP OPCache?
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Installation
OpCache is compiled by default on PHP5.5+. However it is disabled by default. In order to start using OpCache in PHP5.5+ you will first have to enable it. To do this you would have to do the following.
Add the following line to your ph...
Why does one hot encoding improve machine learning performance?
...it gives significantly better results with respect to prediction accuracy, compared to using the original matrix itself as training data. How does this performance increase happen?
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How to add/update an attribute to an HTML element using JavaScript?
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“unadd” a file to svn before commit
I was in the middle of doing a recursive svn add/commit, and a folder which did not have the proper ignore properties was included. I've got about 100 uploaded binary files versioned now, but I haven't committed yet.
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git diff renamed file
...h the difference between HEAD^^ and HEAD is that you have an a.txt in both commits, so just considering those two commits (which is what diff does), there is no rename, there is a copy and a change.
To detect copies, you can use -C:
git diff -C HEAD^^ HEAD
Result:
index ce01362..dd7e1c6 100644
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How do I check/uncheck all checkboxes with a button using jQuery?
... -1 as toggle is not meant for working like that: api.jquery.com/toggle (at least the current version)
– estani
Apr 16 '13 at 17:10
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Can't escape the backslash with regex?
...pe sequences to avoid having to use as many - for instance, in Python:
re.compile(r'\\')
The r in front of the quotes makes it a raw string which doesn't parse backslash escapes.
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Why does Convert.ToString(null) return a different value if you cast null?
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There are 2 overloads of ToString that come into play here
Convert.ToString(object o);
Convert.ToString(string s);
The C# compiler essentially tries to pick the most specific overload which will work with the input. A null value is convertible to any reference...
Object.getOwnPropertyNames vs Object.keys
... Object.defineProperties), for example:
a.test = 21;
then such property becomes an enumerable automatically and both methods produce the same array.
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C# List of objects, how do I get the sum of a property
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I am also interested in @CodeBlend's question. Will this computation be faster than a for loop?
– rex
Feb 25 '14 at 11:29
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