Combining Array Functions Like a Boss

Combining Array Functions Like a Boss

The real magic begins when you start to combine array functions. Here is how you can trim and remove empty values in just a single line of code with array_filter() and array_map():

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$values = ['say  ', '  bye', ' ', ' to', ' spaces ', '   '];   $words = array_filter(array_map('trim', $values)); print_r($words); // ['say', 'bye', 'to', 'spaces']

To create an id to a title map from an array of models, we can use a combination of array_combine() and array_column():

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$models = [$model1, $model2, $model3];   $id_to_title = array_combine(     array_column($models, 'id'),     array_column($models, 'title') );

To get the top three values of an array, we can use array_count_values(), arsort(), and array_slice():

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$letters = ['a', 'a', 'a', 'a', 'b', 'b', 'c', 'd', 'd', 'd', 'd', 'd'];   $values = array_count_values($letters); // get key to count array arsort($values); // sort descending preserving key $top = array_slice($values, 0, 3); // get top 3   print_r($top); // Array // ( //     [d] => 5 //     [a] => 4 //     [b] => 2 // )

It is easy to use array_sum() and array_map() to calculate the sum of order in a few rows:

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$order = [     ['product_id' => 1, 'price' => 99, 'count' => 1],     ['product_id' => 2, 'price' => 50, 'count' => 2],     ['product_id' => 2, 'price' => 17, 'count' => 3], ];   $sum = array_sum(array_map(function($product_row) {     return $product_row['price'] * $product_row['count']; }, $order));   print_r($sum); // 250