Operator |>

    $value = $array
        |> array_map($$, 'callback')
        |> array_filter($$);


Operator -->

    $value = $array
        --> array_map($$, 'callback')
        --> array_filter($$);


Operator $>

    $value = $array
        $> array_map($$, 'callback')
        $> array_filter($$);


Operator <-

    $value = $array
        <- array_map($$, 'callback')
        <- array_filter($$);


Operator =>

    $value = $array
        => array_map($$, 'callback')
        => array_filter($$);


Operator ..

    $value = $array
        .. array_map($$, 'callback')
        .. array_filter($$);


No operator

    $value = $array
        array_map($$, 'callback')
        array_filter($$);


Operator string

    $value = $array
        chain array_map($$, 'callback')
        chain array_filter($$);