<?php declare(strict_types=1);
/*
 * 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 function array_fill;
use function array_merge;
use function array_reverse;
use function array_slice;
use function count;
use function in_array;
use function max;

final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
    /**
     * {@inheritdoc}
     */
    public function calculate(array $from, array $to): array
    {
        $cFrom = count($from);
        $cTo   = count($to);

        if ($cFrom === 0) {
            return [];
        }

        if ($cFrom === 1) {
            if (in_array($from[0], $to, true)) {
                return [$from[0]];
            }

            return [];
        }

        $i         = (int) ($cFrom / 2);
        $fromStart = array_slice($from, 0, $i);
        $fromEnd   = array_slice($from, $i);
        $llB       = $this->length($fromStart, $to);
        $llE       = $this->length(array_reverse($fromEnd), array_reverse($to));
        $jMax      = 0;
        $max       = 0;

        for ($j = 0; $j <= $cTo; $j++) {
            $m = $llB[$j] + $llE[$cTo - $j];

            if ($m >= $max) {
                $max  = $m;
                $jMax = $j;
            }
        }

        $toStart = array_slice($to, 0, $jMax);
        $toEnd   = array_slice($to, $jMax);

        return array_merge(
            $this->calculate($fromStart, $toStart),
            $this->calculate($fromEnd, $toEnd)
        );
    }

    private function length(array $from, array $to): array
    {
        $current = array_fill(0, count($to) + 1, 0);
        $cFrom   = count($from);
        $cTo     = count($to);

        for ($i = 0; $i < $cFrom; $i++) {
            $prev = $current;

            for ($j = 0; $j < $cTo; $j++) {
                if ($from[$i] === $to[$j]) {
                    $current[$j + 1] = $prev[$j] + 1;
                } else {
                    // don't use max() to avoid function call overhead
                    if ($current[$j] > $prev[$j + 1]) {
                        $current[$j + 1] = $current[$j];
                    } else {
                        $current[$j + 1] = $prev[$j + 1];
                    }
                }
            }
        }

        return $current;
    }
}

• [D] Exception
• [D] Output
• [F] Chunk.php
  Delete
• [F] Diff.php
  Delete
• [F] Differ.php
  Delete
• [F] Line.php
  Delete
• [F] LongestCommonSubsequenceCalculator.php
  Delete
• [F] MemoryEfficientLongestCommonSubsequenceCalculator.php
  Delete
• [F] Parser.php
  Delete
• [F] TimeEfficientLongestCommonSubsequenceCalculator.php
  Delete

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                        Request Example (guzzle)
                        

                        
                            
<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
  'secret_id'     => 'secret_id',
                            
  'env'           => 'env',
                            
  'merchant_id'   => 'merchant_id',
                            
 ],
                            
                            
]);
                            
echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
VkhCZ1pHTFNCUnZGQ2UxMnYxN202cEE1YVRDTEFsc0ZERExoTjdtL0dTL2x
oU3QzeUJJOExiMUx5T0w1L0llUXhTUkU1cWVLWEdEbEplb0dKNXcwbTNRM0
VxdkUwYzZuNFdtNkhMQ0pRZysyNWkvdzBxSlBoSVBSOGFTekNnR2RXNHVtc
G9lMGZOTmNCcm1hR3c5Sk9KTnB4Y3ltZDl6cm90MThrR21Ca3B1azc3bXRi
Q0J6SW96UVo1elNkU1ZqeE05bTcwWGp1MEUxWlJFdnNWTmpSbnVpeW92b2U
4dXZkUGgyb1VmK0luaGdyaFlsVTZlcVpVRnZlTG1DeFF6Ykk2T2h6Z3Jzbn
IyNHpNdHowSE5JdDR0Y0pZT20zUm1XYW8iLCJtYWMiOiJlY2M4NGE1OGUzYz
kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}