Reajustes salárial usando a função array_map

using_array_map_2.php

<?php

//Lista de funcionários e seus correspondentes salários:
$listSalary = array(
	'employee_1' => 2100.00,
	'employee_2' => 2500.00,
	'employee_3' => 3000.00,
	'employee_4' => 1300.00,
	'employee_5' => 2100.00,
);

//Função para reajustes salárial:
function readjustSalary($value) {
	
	$readjustmentValue = 5.0;//5%
	return $value + ($value * $readjustmentValue / 100);
	
}

$listSalary = array_map('readjustSalary', $listSalary);

print_r($listSalary);