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How do I implement a callback in PHP?

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Is char signed or unsigned by default?

... is signed, but you can modify that with -funsigned-char. note: for gcc in Android NDK, the default is unsigned. You can also explicitly ask for signed characters with -fsigned-char. On MSVC, the default is signed but you can modify that with /J. ...
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What is the difference between save and insert in Mongo DB?

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How to tell if a file is git tracked (by shell exit code)?

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Flatten an Array of Arrays in Swift

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Place cursor at the end of text in EditText

....post( new Runnable({... et.setSel... to get in the queue. This is because android waits to do some layout stuff until a better time by posting so if you try to setSelection before the system is finished it will undo your work. – MinceMan Dec 7 '13 at 18:16 ...
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What's an easy way to read random line from a file in Unix command line?

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What is mutex and semaphore in Java ? What is the main difference?

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How to create a cron job using Bash automatically without the interactive editor?

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Disabled form inputs do not appear in the request

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