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Update Functional-Programming.md

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Michael
2018-02-26 11:19:29 +01:00
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@@ -8,7 +8,7 @@ sitemap: true
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 and a function can return other functions (a feature called higher-order functions).
other 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 is on iteration.
@@ -71,12 +71,12 @@ $output = array_filter($input, criteria_greater_than(3));
print_r($output); // items > 3
{% endhighlight %}
Each filter function in the family accepts only elements greater than some minimum value. Single filter returned by
Each filter function in the family accepts only elements greater than some minimum value. The single filter returned by
`criteria_greater_than` is a closure with `$min` argument closed by the value in the scope (given as an argument when
`criteria_greater_than` is called).
Early binding is used by default for importing `$min` variable into the created function. For true closures with late
binding one should use a reference when importing. Imagine a templating or input validation library, where closure is
binding one should use a reference when importing. Imagine a templating or input validation library, where a closure is
defined to capture variables in scope and access them later when the anonymous function is evaluated.
* [Read about Anonymous functions][anonymous-functions]