Arrays & Array functions | PHP for Beginners - Part 7

In this particular video we will learn how to work with arrays in PHP.
We will understand what is an array, how to create it. How to add, remove and update elements.
We will learn some basic array operations, understand how to merge strings.
We will also see some advanced array functions: filter, map, reduce.
We will also work with associative and multidimensional arrays.
We will touch with the mostly used array functions.

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[gnifjqd]

$squares = array_map(fn($n) => $n * $n, $numbers); what is fn? when i use fn
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')'

i do it
function square($n) {

return $n * $n;
};
$squares = array_map('square', $numbers);