Conditionally add key and value inside array();

Condition_in_Array_Definition.php

<?php
$condition = true;

$arr = array(
	'a' => 'abc', 
	($condition ? 'b' : '') => ($condition ? '123' : ''),
	($condition ? 'c' : '') => ($condition ? 'xyz' : ''),
);

$arr = array_filter($arr);

var_dump($arr);
?>