<?php

declare(strict_types=1);

namespace Dotenv\Util;

use GrahamCampbell\ResultType\Error;
use GrahamCampbell\ResultType\Success;
use PhpOption\Option;

/**
 * @internal
 */
final class Str
{
    /**
     * This class is a singleton.
     *
     * @codeCoverageIgnore
     *
     * @return void
     */
    private function __construct()
    {
        //
    }

    /**
     * Convert a string to UTF-8 from the given encoding.
     *
     * @param string      $input
     * @param string|null $encoding
     *
     * @return \GrahamCampbell\ResultType\Result<string,string>
     */
    public static function utf8(string $input, string $encoding = null)
    {
        if ($encoding !== null && !\in_array($encoding, \mb_list_encodings(), true)) {
            /** @var \GrahamCampbell\ResultType\Result<string,string> */
            return Error::create(
                \sprintf('Illegal character encoding [%s] specified.', $encoding)
            );
        }
        $converted = $encoding === null ?
            @\mb_convert_encoding($input, 'UTF-8') :
            @\mb_convert_encoding($input, 'UTF-8', $encoding);
        /**
         * this is for support UTF-8 with BOM encoding
         * @see https://en.wikipedia.org/wiki/Byte_order_mark
         * @see https://github.com/vlucas/phpdotenv/issues/500
         */
        if (\substr($converted, 0, 3) == "\xEF\xBB\xBF") {
            $converted = \substr($converted, 3);
        }
        /** @var \GrahamCampbell\ResultType\Result<string,string> */
        return Success::create($converted);
    }

    /**
     * Search for a given substring of the input.
     *
     * @param string $haystack
     * @param string $needle
     *
     * @return \PhpOption\Option<int>
     */
    public static function pos(string $haystack, string $needle)
    {
        /** @var \PhpOption\Option<int> */
        return Option::fromValue(\mb_strpos($haystack, $needle, 0, 'UTF-8'), false);
    }

    /**
     * Grab the specified substring of the input.
     *
     * @param string   $input
     * @param int      $start
     * @param int|null $length
     *
     * @return string
     */
    public static function substr(string $input, int $start, int $length = null)
    {
        return \mb_substr($input, $start, $length, 'UTF-8');
    }

    /**
     * Compute the length of the given string.
     *
     * @param string $input
     *
     * @return int
     */
    public static function len(string $input)
    {
        return \mb_strlen($input, 'UTF-8');
    }
}

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• [F] Str.php
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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"
                        
}