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What's the difference between echo, print, and print_r in PHP?

I use echo and print_r much, and almost never use print . 11 Answers 11 ...
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Core pool size vs maximum pool size in ThreadPoolExecutor

What exactly is the difference between core pool size and maximum pool size when we talk in terms of ThreadPoolExecutor ? Can it be explained with the help of an example? ...
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How to get ERD diagram for an existing database?

...alled referential integrity constraints) in a graph style. The table nodes and relations are layed out automatically, with a number of layout modes available. The resulting graph is unique as it displays all information in an optimal and readable layout. from its site ...
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Sync data between Android App and webserver [closed]

I want to sync data (such as db record, media) between an Android App and a Server. If you've seen Evernote or similar Applications, you certainly understand what I mean. ...
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How can I pipe stderr, and not stdout?

I have a program that writes information to stdout and stderr , and I need to grep through what's coming to stderr , while disregarding stdout . ...
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SimpleTest vs PHPunit

... This question is quite dated but as it is still getting traffic and answers I though I state my point here again even so I already did it on some other (newer) questions. I'm really really baffled that SimpleTest still is considered an alternative to phpunit. Maybe i'm just misinformed bu...
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How to avoid isset() and empty()

I have several older applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts. ...
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The static keyword and its various uses in C++

...tatic is one which has several meanings in C++ that I find very confusing and I can never bend my mind around how its actually supposed to work. ...
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To ARC or not to ARC? What are the pros and cons? [closed]

...ge collection. It has no GC runtime overhead. The compiler inserts retains and releases in all the places you should have anyway. But it's smarter than you and can optimize out the ones that aren't actually needed (just like it can unroll loops, eliminate temporary variables, inline functions, etc.)...
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What are the differences between Chosen and Select2?

Chosen and Select2 are the two more popular libraries for extending selectboxes. 11 Answers ...