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Merge pull request #335 from weakish/patch-2

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higher order functions
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Josh Lockhart
2014-02-01 07:08:07 -08:00
parent dfe8735935 9bca711909
commit 4524c23e01
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@@ -7,14 +7,14 @@ title: Functional Programming in PHP
PHP supports first-class functions, meaning that a function can be assigned to a variable. Both user-defined and built-in PHP supports first-class functions, meaning that a function can be assigned to a variable. Both user-defined and built-in
functions can be referenced by a variable and invoked dynamically. Functions can be passed as arguments to other functions can be referenced by a variable and invoked dynamically. Functions can be passed as arguments to other
functions (a feature called higher-order functions) and a function can return other functions. functions and a function can return other functions (a feature called higher-order functions).
Recursion, a feature that allows a function to call itself, is supported by the language, but most of the PHP code focus Recursion, a feature that allows a function to call itself, is supported by the language, but most of the PHP code focus
is on iteration. is on iteration.
Anonymous functions (with support for closures) have been present since PHP 5.3 (2009). Anonymous functions (with support for closures) have been present since PHP 5.3 (2009).
PHP 5.4 added the ability to bind closures to an object's scope and also improved support for callables such that they PHP 5.4 added the ability to bind closures to an object's scope and also improved support for callables such that they
can be used interchangeably with anonymous functions in almost all cases. can be used interchangeably with anonymous functions in almost all cases.
The most common usage of higher-order functions is when implementing a strategy pattern. The built-in `array_filter` The most common usage of higher-order functions is when implementing a strategy pattern. The built-in `array_filter`