php - how to solve error {"message":"Could not authenticate you","code":32} -

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i want fetch public posts twitter. create app in twitter , gather consumer key (api key),consumer secret (api secret),access level,access token,access token secret,access level , write program. @ run time shows error

{"message":"could not authenticate you","code":32}.

create class twitterapi keys private set post. create function setgetfield()

public function setgetfield($string)     {         if (!is_null($this->getpostfields()))          {              throw new exception('you can choose or post fields.');          }          $search = array('#', ',', '+', ':');         $replace = array('%23', '%2c', '%2b', '%3a');         $string = str_replace($search, $replace, $string);            $this->getfield = $string;          return $this;     }

create function getgetfields() collect field twitter.

public function getgetfields()     {         return $this->getfield;     }

to build oauth write buildouath fuction

 public function buildoauth($url, $requestmethod)     {         if (!in_array(strtolower($requestmethod), array('post', 'get')))         {             throw new exception('request method must either post or get');         }          $consumer_key = $this->consumer_key;         $consumer_secret = $this->consumer_secret;         $oauth_access_token = $this->oauth_access_token;         $oauth_access_token_secret = $this->oauth_access_token_secret;          $oauth = array(              'oauth_consumer_key' => $consumer_key,             'oauth_nonce' => time(),             'oauth_signature_method' => 'hmac-sha1',             'oauth_token' => $oauth_access_token,             'oauth_timestamp' => time(),             'oauth_version' => '1.0'         );          $getfield = $this->getgetfield();          if (!is_null($getfield))         {             $getfields = str_replace('?', '', explode('&', $getfield));             foreach ($getfields $g)             {                 $split = explode('=', $g);                 $oauth[$split[0]] = $split[1];             }         }          $base_info = $this->buildbasestring($url, $requestmethod, $oauth);         $composite_key = rawurlencode($consumer_secret) . '&' . rawurlencode($oauth_access_token_secret);         $oauth_signature = base64_encode(hash_hmac('sha1', $base_info, $composite_key, true));         $oauth['oauth_signature'] = $oauth_signature;          $this->url = $url;         $this->oauth = $oauth;          return $this;     }

to generate authorisation header 

 private function buildauthorizationheaders($oauth)      {         $return = 'authorization: oauth ';         $values = array();          foreach($oauth $key => $value)         {             $values[] = "$key=\"" . rawurlencode($value) . "\"";         }          $return .= implode(', ', $values);         return $return;     }

how solve difficulty


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