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Source: dev.to
php: tame arrays with map, filter and reduce
it's easy to let arrays get away on you and wind up writing complex, hard-to-test foreach loops to modify or filter your data. php's array_map(), array_filter() and array_reduce() functions allow us to handle arrays in a clean, concise and powerful way by letting us use ideas from https://www.infoworld.com/article/3613715/what-is-functional-programming-a-practical-guide.html.
here we assign our doubling function to the variable $double and then pass that variable as an argument to array_map(): $double = function($element) { return $element * 2; }; $result = array_map($double, $testArray); Enter fullscreen mode
Exit fullscreen mode #callbacks-with-extra-arguments callbacks with extra arguments so far, all of the callable functions that we have passed to array_map() have only taken one argument: the element of the array.
if we run this snippet, we will get: Array ( => Array ([name] => Used album [price] => $5.00 [country] => US )
here we assign our doubling function to the variable $double and then pass that variable as an argument to array_map(): $double = function($element) { return $element * 2; }; $result = array_map($double, $testArray); Enter fullscreen mode
Exit fullscreen mode #callbacks-with-extra-arguments callbacks with extra arguments so far, all of the callable functions that we have passed to array_map() have only taken one argument: the element of the array.
if we run this snippet, we will get: Array ( => Array ([name] => Used album [price] => $5.00 [country] => US )
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