Tutorial by Topics: t

As more secure web services avoid storing passwords in plain text format, languages such as PHP provide various (undecryptable) hash functions to support the more secure industry standard. This topic provides documentation for proper hashing with PHP. string password_hash ( string $password , ...

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This is a simple hello world function in Common Lisp. Examples will print the text Hello, World! (without quotation marks; followed by a newline) to the standard output. Common Lisp is a programming language that is largely used interactively using an interface known as a REPL. The REPL (Read Eva...

Properties: Associated with a type Variables: Not associated with a type See the Swift Programming Language iBook for more information.

FunctionDetailsob_start()Starts the output buffer, any output placed after this will be captured and not displayedob_get_contents()Returns all content captured by ob_start()ob_end_clean()Empties the output buffer and turns it off for the current nesting levelob_get_clean()Triggers both ob_get_cont...

Due to the GIL (Global interpreter lock) only one instance of the python interpreter executes in a single process. So in general, using multi-threading only improves IO bound computations, not CPU-bound ones. The multiprocessing module is recommended if you wish to parallelise CPU-bound tasks. G...

Threads allow Python programs to handle multiple functions at once as opposed to running a sequence of commands individually. This topic explains the principles behind threading and demonstrates its usage.

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While everything in Node.js is generally done asynchronously, require() is not one of those things. Since modules in practice only need to be loaded once, it is a blocking operation and should be used properly. Modules are cached after the first time they are loaded. Should you be editing a modul...

SELECT column_1 [, column_2 ] FROM table_1 ORDER BY order_column LIMIT row_count [OFFSET row_offset] SELECT column_1 [, column_2 ] FROM table_1 ORDER BY order_column LIMIT [row_offset,] row_count "Limit" could mean "Max number of rows in a table". "Offset&q...

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@interface ClassName (categoryName) // ClassName is the class to be extended // Method and property declarations @end To avoid method name clashes, it is recommended to use prefixes (like xyz_ in the example). If methods with the same name exist, it is undefined which one will...

An assertion is a predicate that the presented condition must be true at the moment the assertion is encountered by the software. Most common are simple assertions, which are validated at execution time. However, static assertions are checked at compile time. assert(expression) static_assert(...

Oracle is a relational database management system (RDBMS) originally built by Larry Ellison, Bob Miner, and Ed Oates in the late 70s. It was intended to be compatible with IBM's System R. VersionRelease DateVersion 1 (unreleased)1978-01-01Oracle V21979-01-01Oracle Version 31983-01-01Oracle Ver...

The C language does not define a linked list data structure. If you are using C and need a linked list, you either need to use a linked list from an existing library (such as GLib) or write your own linked list interface. This topic shows examples for linked lists and double linked lists that ca...

In C++, it is possible to define operators such as + and -> for user-defined types. For example, the <string> header defines a + operator to concatenate strings. This is done by defining an operator function using the operator keyword. The operators for built-in types cannot be change...