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PHP: How to send HTTP response code?

I have a PHP script that needs to make responses with HTTP response codes (status-codes), like HTTP 200 OK, or some 4XX or 5XX code. ...
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How to remove all subviews of a view in Swift?

I'm looking for a simple method to remove at once all subviews from a superview instead of removing them one by one. 20 Ans...
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Why doesn't margin:auto center an image?

The div expands to 100% as it should but the image does not center itself. Why? 8 Answers ...
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How to do what head, tail, more, less, sed do in Powershell? [closed]

On windows, using Powershell, what are the equivalent commands to linux's head , tail , more , less and sed ? 7 Answe...
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Using Font Awesome icon for bullet points, with a single list item element

We'd like to be able to use a Font Awesome ( http://fortawesome.github.com/Font-Awesome/ ) icon as a bullet point for unordered lists in a CMS. ...
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Find a pair of elements from an array whose sum equals a given number

Given array of n integers and given a number X, find all the unique pairs of elements (a,b), whose summation is equal to X. ...
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Equivalent of strace -feopen < command > on mac os X

This is useful for debugging (hence programming related). On linux, we can use the command 1 Answer ...
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How to Resize a Bitmap in Android?

I have a bitmap taken of a Base64 String from my remote database, ( encodedImage is the string representing the image with Base64): ...
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jQuery scroll to element

I have this input element: 32 Answers 32 ...
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How to redirect output of an already running process [duplicate]

Normally I would start a command like 5 Answers 5 ...