https://studevsoc.com/2017/09/22/code-challenge-05/

sds-coding-challenge-week-5

<?php
/**
 * @author Subin Siby <subinsb.com>
 */

function getInput()
{
    return trim(fgets(STDIN));
}

function getResult($i)
{
    $s = explode("\n", $i);

    $words = $s[0];
    $length = $s[1];

    preg_match_all('/([a-z|A-Z|\.|\s])=\s(.*?)[,|\z]/', $words, $matches, PREG_SET_ORDER);

    $letters = [];

    foreach($matches as $match) {
        $positions = explode(' ', $match[2]);

        foreach ($positions as $position) {
            $letters[$position] = $match[1];
        }
    }

    ksort($letters);

    return implode('', $letters);
}

echo 'Enter file path:';
$i = getInput();
echo 'Your string:' . PHP_EOL . getResult(file_get_contents($i)) . PHP_EOL;