ELI5：这段代码令人困惑

Question

$lastEl = array_values(array_slice($array, -1))[0];

So I understand array_values and array_slice but I'm not sure what the indicator on the end is doing to it.

Can somebody help?

Answer 1

If you break it down...

$lastEl = array_values(array_slice($array, -1))[0];

Firstly...

array_slice($array, -1)

This is taking part of the array the -1 means from the end of the array, so this takes the last element and returns an array.

array_values(array_slice($array, -1))

This returns the values from the returned array - again as an array.

[0]

Takes the first element of the resultant array, as so far the result has been an array of 1 element (the last one) it converts the result from an array to the value of the last element of the array.

So an example...

$array = [1,2,3,4,5];
$lastEl = array_values(array_slice($array, -1))[0];
var_dump($lastEl);

will output

/home/nigel/workspace2/Test/t2.php:8:
int(5)