php post json参数的传递和接收处理方法

<? function http_post_data($url, $data_string) {    $ch = curl_init();   curl_setopt($ch, CURLOPT_POST, 1);   curl_setopt($ch, CURLOPT_URL, $url);   curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);   curl_setopt($ch, CURLOPT_HTTPHEADER, array(    'Content-Type: application/json; charset=utf-8',    'Content-Length: ' . strlen($data_string))   );   ob_start();   curl_exec($ch);   $return_content = ob_get_contents();   //echo $return_content."<br>";   ob_end_clean();    $return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);   // return array($return_code, $return_content);   return $return_content;  }  $url = "http://127.0.0.1/2.php"; $data = json_encode(array('a'=>"weqweqwe", 'b'=>2));   //list($return_code, $return_content) = http_post_data($url, $data); $aaa = http_post_data($url, $data); //print_r($aaa); echo $aaa;  $ccc=json_decode($aaa); print_r($ccc); echo $ccc->b;  echo "<hr>"; $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; var_dump(json_decode($json,true)); 　 ?> 

<? $postData = file_get_contents('php://input'); echo $postData; $data = json_encode(array('a'=>" 234 ", 'b'=>2)); echo $data; ?>