vendor/sebastian/diff/src/Differ.php

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<?php
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Diff;

use SebastianBergmann\Diff\LCS\LongestCommonSubsequence;
use SebastianBergmann\Diff\LCS\TimeEfficientImplementation;
use SebastianBergmann\Diff\LCS\MemoryEfficientImplementation;

/**
 * Diff implementation.
 */
class Differ
{
    /**
     * @var string
     */
    private $header;

    /**
     * @var bool
     */
    private $showNonDiffLines;

    /**
     * @param string $header
     * @param bool   $showNonDiffLines
     */
    public function __construct($header = "--- Original\n+++ New\n", $showNonDiffLines = true)
    {
        $this->header           = $header;
        $this->showNonDiffLines = $showNonDiffLines;
    }

    /**
     * Returns the diff between two arrays or strings as string.
     *
     * @param array|string             $from
     * @param array|string             $to
     * @param LongestCommonSubsequence $lcs
     *
     * @return string
     */
    public function diff($from, $to, LongestCommonSubsequence $lcs = null)
    {
        $from  = $this->validateDiffInput($from);
        $to    = $this->validateDiffInput($to);
        $diff  = $this->diffToArray($from, $to, $lcs);
        $old   = $this->checkIfDiffInOld($diff);
        $start = isset($old[0]) ? $old[0] : 0;
        $end   = \count($diff);

        if ($tmp = \array_search($end, $old)) {