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Do Facebook Oauth 2.0 Access Tokens Expire?

I am playing around with the Oauth 2.0 authorization in Facebook and was wondering if the access tokens Facebook passes out ever expire. If so, is there a way to request a long-life access token? ...
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What is a database transaction?

... To do that you have first to withdraw the amount from the source account, and then deposit it to the destination account. The operation has to succeed in full. If you stop halfway, the money will be lost, and that is Very Bad. In modern databases transactions also do some other things - like ensur...
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How to get the request parameters in Symfony 2?

I am very new to symfony. In other languages like java and others I can use request.getParameter('parmeter name') to get the value. ...
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Turning multi-line string into single comma-separated

... You can use awk and sed: awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/' Or if you want to use a pipe: echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/' To break it down: awk is great at handling data broken down into fi...
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Convert one date format into another in PHP

...wever, even strtotime() doesn't recognize the y-m-d-h-i-s format. PHP 5.3 and up Use DateTime::createFromFormat. It allows you to specify an exact mask - using the date() syntax - to parse incoming string dates with. PHP 5.2 and lower You will have to parse the elements (year, month, day, hour, ...
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Suppress warning “Category is implementing a method which will also be implemented by its primary cl

...cify which implementation they want. So, you should either use a category and provide method names that are new and unique for the class, or subclass if you want to change the behavior of an existing method in a class. shar...
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Representing Directory & File Structure in Markdown Syntax [closed]

...n't be any issue with Markdown, it is going to be on your Jekyll templates and users web browsers. – RobertKenny Nov 1 '13 at 9:31 1 ...
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Generic htaccess redirect www to non-www

...th the double slashes. So I did RewriteRule ^(.*)$ http://%1$1 [R=301,L] and it seems to be working so far – bobfet1 Mar 22 '12 at 13:59 ...
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“Auto Layout still required after executing -layoutSubviews” with UITableViewCell subclass

Using XCode 4.5 and iOS 6, I'm developing an app with a simple table view with custom cells. I've done this a hundred times in iOS 5 and below, but for some reason the new autoLayout system is giving me a lot of trouble. ...
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How to list all the files in a commit?

I am looking for a simple git command that provides a nicely formatted list of all files that were part of the commit given by a hash (SHA1), with no extraneous information. ...