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Magic quotes was a feature of the PHP scripting language, wherein strings are automatically escaped—special characters are prefixed with a backslash—before being passed on. It was introduced to help newcomers write functioning SQL commands without requiring manual escaping.
In the context of computer programming, magic is an informal term for abstraction; it is used to describe code that handles complex tasks while hiding that complexity to present a simple interface. The term is somewhat tongue-in-cheek , and often carries bad connotations, implying that the true behavior of the code is not immediately apparent.
Magic words (including parser functions, variables and behavior switches) are features of wiki markup that give instructions to Wikipedia's underlying MediaWiki software. For example, magic words can suppress or position the table of contents, disable indexing by external search engines, and produce output dynamically based on the current page or on user-defined conditional logic.
For more detailed information on all magic words (behaviour switches, variables and parser functions), consider reading: Help:Magic words: a more detailed help page. mw:Help:Magic words: details of all available MediaWiki standard magic words. mw:Help:Extension:ParserFunctions: parser function extensions to MediaWiki, to supplement magic words.
where a is an array object, the function randomInt(x) chooses a random integer between 1 and x, inclusive, and swapEntries(i, j) swaps the ith and jth entries in the array. In the preceding example, 52 and 53 are magic numbers, also not clearly related to each other. It is considered better programming style to write the following:
Magic Lantern Video file [58] 44 43 4D 01 50 41 33 30 50 41 33 30: DCM␁PA30 PA30: 0 Windows Update Binary Delta Compression file [59] 37 7A BC AF 27 1C: 7z¼¯'␜ 0 7z 7-Zip File Format 1F 8B ␟‹ 0 gz tar.gz GZIP compressed file [60] FD 37 7A 58 5A 00: ý7zXZ␀ 0 xz tar.xz XZ compression utility using LZMA2 compression 04 22 4D 18 ␄"M ...
PHP defines a large array of functions in the core language and many are also available in various extensions; these functions are well documented online PHP documentation. [224] However, the built-in library has a wide variety of naming conventions and associated inconsistencies, as described under history above.
In PHP 5, autoload functionality is triggered when referencing an undefined class. One or more autoload functions—implemented as the __autoload magic function or any function registered to the SPL autoload stack—is called and given the opportunity to define the class, usually by loading the file it is defined in.