pavel1

<?php

$root = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'];

$inserts = [1, 2];

foreach ($inserts as $insert) {
    for ($i = 0; $i <= count($root); $i++) {
        $root_instance = $root;
        array_splice($root_instance, $i, 0, $insert);

        foreach ($inserts as $var) {
            for ($y = 0; $y <= count($root) + 1; $y++) {
                $root_instance2 = $root_instance;
                array_splice($root_instance2, $y, 0, $insert);

                echo implode(' ', $root_instance2) . '<br>';
            }
        }
    }
}