Rename variables used in map method

[alexander-schranz]

As most people (including me) are lazy people to read text and mostly looks just at the code. Using key and value as variable make the map faster to understand which argument is which one :)

[GromNaN]

The code has the same semantics.

Twig/src/Extension/CoreExtension.php

Lines 1661 to 1663 in 1231fd4

	foreach ($array as $k => $v) {
	$r[$k] = $arrow($v, $k);
	}

[fabpot]

Thank you @alexander-schranz.