Integer Insertion

<?php

$line = array_map('intval', explode(' ', readline()));

$input = readline();

while ($input !== 'end') {
    $number = intval($input);

    if (strlen($input) === 1) {
        array_splice($line, $number, 0, $number);
    } else {
        $index = substr($input, 0, (strlen($input) - 1) * -1);
        array_splice($line, intval($index), 0, $number);
    }

    $input = readline();
}
echo implode(' ', $line);