Mehen Games Test

mehen-games-test-1.php

<?php

/**
 * Mehen games test
 *
 * @author sagittaracc <sagittaracc@gmail.com>
 */

// Массив имеет произвольные значения
$array = [-1, 2, 10, 3, -5, 3];
$needle = 5;

$distances = array_map(function($haystack) use ($needle){
    return abs($haystack - $needle);
}, $array);

$minDistance = min($distances);
$closestToTheNeedle = array_search($minDistance, $distances);

echo $closestToTheNeedle;
echo "\n";

/**
 * ----------------------------------------------------------
 */

// Массив отсортирован
$array = [1, 2, 3, 5, 6];
$needle = 4;

function needleBetween($leftOne, $rightOne, $needle)
{
    return $leftOne <= $needle && $needle <= $rightOne;
}

function needleCloserToTheLeftOne($leftOne, $rightOne, $needle)
{
    return $needle - $leftOne <= $rightOne - $needle;
}

for ($i = 0; $i < count($array); $i++) {
    $leftOne = $array[$i];
    $rightOne = $array[$i + 1];
	
    if (needleBetween($leftOne, $rightOne, $needle)) {
        echo needleCloserToTheLeftOne($leftOne, $rightOne, $needle)
            ? $i
            : $i + 1;
        echo "\n";
        break;
    }
}