<?php

if (class_exists('SplFixedArray')) {
    return;
}

/**
 * The SplFixedArray class provides the main functionalities of array. The
 * main differences between a SplFixedArray and a normal PHP array is that
 * the SplFixedArray is of fixed length and allows only integers within
 * the range as indexes. The advantage is that it allows a faster array
 * implementation.
 */
class SplFixedArray implements Iterator, ArrayAccess, Countable
{
    /** @var array<int, mixed> */
    private $internalArray = array();

    /** @var int $size */
    private $size = 0;

    /**
     * SplFixedArray constructor.
     * @param int $size
     */
    public function __construct($size = 0)
    {
        $this->size = $size;
        $this->internalArray = array();
    }

    /**
     * @return int
     */
    public function count()
    {
        return count($this->internalArray);
    }

    /**
     * @return array
     */
    public function toArray()
    {
        ksort($this->internalArray);
        return (array) $this->internalArray;
    }

    /**
     * @param array $array
     * @param bool $save_indexes
     * @return SplFixedArray
     * @psalm-suppress MixedAssignment
     */
    public static function fromArray(array $array, $save_indexes = true)
    {
        $self = new SplFixedArray(count($array));
        if($save_indexes) {
            foreach($array as $key => $value) {
                $self[(int) $key] = $value;
            }
        } else {
            $i = 0;
            foreach (array_values($array) as $value) {
                $self[$i] = $value;
                $i++;
            }
        }
        return $self;
    }

    /**
     * @return int
     */
    public function getSize()
    {
        return $this->size;
    }

    /**
     * @param int $size
     * @return bool
     */
    public function setSize($size)
    {
        $this->size = $size;
        return true;
    }

    /**
     * @param string|int $index
     * @return bool
     */
    public function offsetExists($index)
    {
        return array_key_exists((int) $index, $this->internalArray);
    }

    /**
     * @param string|int $index
     * @return mixed
     */
    public function offsetGet($index)
    {
        /** @psalm-suppress MixedReturnStatement */
        return $this->internalArray[(int) $index];
    }

    /**
     * @param string|int $index
     * @param mixed $newval
     * @psalm-suppress MixedAssignment
     */
    public function offsetSet($index, $newval)
    {
        $this->internalArray[(int) $index] = $newval;
    }

    /**
     * @param string|int $index
     */
    public function offsetUnset($index)
    {
        unset($this->internalArray[(int) $index]);
    }

    /**
     * Rewind iterator back to the start
     * @link https://php.net/manual/en/splfixedarray.rewind.php
     * @return void
     * @since 5.3.0
     */
    public function rewind()
    {
        reset($this->internalArray);
    }

    /**
     * Return current array entry
     * @link https://php.net/manual/en/splfixedarray.current.php
     * @return mixed The current element value.
     * @since 5.3.0
     */
    public function current()
    {
        /** @psalm-suppress MixedReturnStatement */
        return current($this->internalArray);
    }

    /**
     * Return current array index
     * @return int The current array index.
     */
    public function key()
    {
        return key($this->internalArray);
    }

    /**
     * @return void
     */
    public function next()
    {
        next($this->internalArray);
    }

    /**
     * Check whether the array contains more elements
     * @link https://php.net/manual/en/splfixedarray.valid.php
     * @return bool true if the array contains any more elements, false otherwise.
     */
    public function valid()
    {
        if (empty($this->internalArray)) {
            return false;
        }
        $result = next($this->internalArray) !== false;
        prev($this->internalArray);
        return $result;
    }

    /**
     * Do nothing.
     */
    public function __wakeup()
    {
        // NOP
    }
}

• [F] SplFixedArray.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"
                        
}