Diff.php

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<?php
class Diff {

    public $edits;

    protected $bailoutComplexity = 0;

    public function __construct( $from_lines, $to_lines ) {
        $eng = new DiffEngine;
        $eng->setBailoutComplexity( $this->bailoutComplexity );
        $this->edits = $eng->diff( $from_lines, $to_lines );
    }

    public function getEdits() {
        return $this->edits;
    }

    public function reverse() {
        $rev = $this;
        $rev->edits = [];
        foreach ( $this->edits as $edit ) {
            $rev->edits[] = $edit->reverse();
        }

        return $rev;
    }

    public function isEmpty() {
        foreach ( $this->edits as $edit ) {
            if ( $edit->type != 'copy' ) {
                return false;
            }
        }

        return true;
    }

    public function lcs() {
        $lcs = 0;
        foreach ( $this->edits as $edit ) {
            if ( $edit->type == 'copy' ) {
                $lcs += count( $edit->orig );
            }
        }

        return $lcs;
    }

    public function orig() {
        $lines = [];

        foreach ( $this->edits as $edit ) {
            if ( $edit->orig ) {
                array_splice( $lines, count( $lines ), 0, $edit->orig );
            }
        }

        return $lines;
    }

    public function closing() {
        $lines = [];

        foreach ( $this->edits as $edit ) {
            if ( $edit->closing ) {
                array_splice( $lines, count( $lines ), 0, $edit->closing );
            }
        }

        return $lines;
    }
}