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How does “do something OR DIE()” work in PHP?

I'm writing a php app to access a MySQL database, and on a tutorial, it says something of the form 4 Answers ...
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What are differences between PECL and PEAR?

... PECL stands for PHP Extension Community Library, it has extensions written in C, that can be loaded into PHP to provide additional functionality. You need to have administrator rights, a C compiler and associated toolchain to install those e...
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Most lightweight way to create a random string and a random hexadecimal number

... Is this random/unique enough to be used in, say, session tokens? – moraes Jul 4 '11 at 12:31 1 ...
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Weird PHP error: 'Can't use function return value in write context'

... I realize I'm super late to this, but it's also PHP version dependent, right? I'm pretty sure that's legal in later PHP versions like 5.6, but I think it doesn't in 5.3 – UnsettlingTrend Dec 8 '16 at 16:14 ...
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Serializing PHP object to JSON

So I was wandering around php.net for information about serializing PHP objects to JSON, when I stumbled across the new JsonSerializable Interface . It's only PHP >= 5.4 though, and I'm running in a 5.3.x environment. ...
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A numeric string as array key in PHP

Is it possible to use a numeric string like "123" as a key in a PHP array, without it being converted to an integer? 11 A...
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Internal Error 500 Apache, but nothing in the logs?

... Please Note: The original poster was not specifically asking about PHP. All the php centric answers make large assumptions not relevant to the actual question. The default error log as opposed to the scripts error logs usually has the (more) specific error. often it will be permissions deni...
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List all the files that ever existed in a Git repository

...ff create A database/migrations/2014_10_12_000000_create_users_table.php A database/migrations/2014_10_12_100000_create_password_resets_table.php A database/migrations/2015_05_11_200932_create_boletin_table.php A database/migrations/2015_05_15_133500_create_usuarios_table.php...
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Pimpl idiom vs Pure virtual class interface

...ect it knows to be this. On the user side of the code, a new A will first allocate sizeof(A) bytes of memory, then hand a pointer to that memory to the A::A() constructor as this. If in a later revision of your library you decide to drop the integer, make it larger, smaller, or add members, there'...
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scala vs java, performance and memory? [closed]

... Well, Rex's solution preallocates the memory for the array, which will make the compiled code run faster (because with your approach, you let the JVM periodically reallocate your array as it grows). Even though there was more typing involved, perfor...