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How to debug Apache mod_rewrite
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One trick is to turn on the rewrite log. To turn it on,try these lines in your apache main config or current virtual host file (not in .htaccess):
RewriteEngine On
RewriteLog "/var/log/apache2/rewrite.log"
RewriteLogLevel 3
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How to create an object for a Django model with a many to many field?
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foo.bars.add(bar1, bar2)
As we can see, passing multiple objects saves one SELECT:
SELECT "app_bar"."id", "app_bar"."name" FROM "app_bar" WHERE "app_bar"."id" = 1
SELECT "app_bar"."id", "app_bar"."name" FROM "app_bar" WHERE "app_bar"."id" = 2
INSERT INTO "app_foo" ("name") VALUES ()
SELECT "app...
What does the thread_local mean in C++11?
...from the viewpoint of the functions using it) but in actual fact, there is one copy per thread.
It adds to the current automatic (exists during a block/function), static (exists for the program duration) and dynamic (exists on the heap between allocation and deallocation).
Something that is thread...
Pure virtual destructor in C++
...pure and doesn't have an implementation, undefined behavior will ensue. On one popular platform, that will invoke the purecall handler and crash.
Edit: fixing the declaration to be more conformant, compiled with http://www.comeaucomputing.com/tryitout/
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Extending from two classes
... can get the functionality from both classes and Still only actually be of one class type.
The drawback is that you cannot fit into the Mold of the Internal class using a cast.
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Pandas conditional creation of a series/dataframe column
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It's a shame i can't upvote this multiple times. One upvote doesn't seem enough.
– Harper
Aug 15 '19 at 9:26
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sho...
What does in XML mean?
...zed inside of comments.
This means given these four snippets of XML from one well-formed document:
<!ENTITY MyParamEntity "Has been expanded">
<!--
Within this comment I can use ]]>
and other reserved characters like <
&, ', and ", but %MyParamEntity; will not be expanded
(...
Type converting slices of interfaces
... hide complex/costly operations. Converting a string to an interface{} is done in O(1) time. Converting a []string to an interface{} is also done in O(1) time since a slice is still one value. However, converting a []string to an []interface{} is O(n) time because each element of the slice must be c...
URL rewriting with PHP
...and if not, redirect again to the correct location. That's how I did it on one of my sites using htaccess.
– Mike
May 5 '13 at 21:09
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What is Common Gateway Interface (CGI)?
...quest to the program and outputs the received response. CGI specifies that one program instance will be launched per each request. This is why CGI is inefficient and kind of obsolete nowadays.
They say that CGI is deprecated. Its no more in use. Is it so? What is its latest update?
CGI is stil...