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Functions

array_map(?callback $callback, array $array, array ...$arrays): array

array_filter(array $array, ?callable $callback = null, int $mode = 0): array

array_reduce(array $array, callable $callback, mixed $initial = null): mixed

array_unique(array $array, int $flags = SORT_STRING): array

Mappers​

array_values(array $array): array
array_keys(array $array): array

Reducers​

array_count_values(array $array): array // like python Counter


Arrays

Map

array_map(?callback $callback, array $array, array ...$arrays): array

Where callback is (any...) => any and the number of arrays passed is the number of arguments.

Filter

array_filter(array $array, ?callable $callback = null, int $mode = 0): array

If callback returns true the value is retained.

Reduce

array_reduce(array $array, callable $callback, mixed $initial = null): mixed

Zip

array_map(null, array $array, array ...$arrays): array

Enumerate

foreach (array_values($lst) as $i => $val) {
        echo "$i $val \n";
}

Associative Array

Map is done using array map while leveraging the ability to zip multiple arrays

array_map($callback, array_keys($arr), array_values($arr));

Filter

array_filter(array $array, ?callable $callback = null, ARRAY_FILTER_USE_BOTH): array

Strings

Types