Three analytic modes of sharing Ajax _ajax related

JSON format in Ajax

HTML code:

PHP Code:

<?php
  //receiving the request data sent by the client
  $user = $_post[' user '];
  is a JSON-formatted string
  //var_dump ($user);
  $json _user = Json_decode ($user, true);
  Var_dump ($json _user[' name '));
  $json = ' {' A ': 1, "B": 2, "C": 3, "D": 4, "E": 5} ';
  Var_dump (Json_decode ($json));
  The response data conforms to the JSON-formatted string
  //1. Manually construct
  //echo ' {' name ': ' Zhouzhiruo ', ' pwd ': ' 123456 '} ';
  2. Use the Json_encode () function
  echo json_encode ($json _user);

XML format in the second Ajax

HTML page:

PHP page code:

  the request data sent by the <?php//Receiving client
  $user = $_post[' user '];//a String type
  //var_dump ($user) conforming to the XML format requirements;
  Create a DOMDocument object
  $doc = new DOMDocument ();
  Call the Loadxml () method
  $result = $doc->loadxml ($user);
  Var_dump ($doc);
  How to build XML-compliant data
  /* Modify response header Content-type value is "Text/xml"
  header (' Content-type:text/xml ');
  echo $user//XML-formatted string type/
  header (' Content-type:application/xml ');
  echo $doc->savexml ();

HTML format in three Ajax

HTML page:

PHP Page:

<?php
  //For processing client request two-level linkage data
  //1. Receive the province information sent by the client
  $province = $_post[' provcince '];
  2. Determine current province information, provide different city information
  switch ($province) {case
    ' Shandong Province ':
      Echo ' Qingdao, Jinan, Weihai, Rizhao, Dezhou ';
      break;
    Case ' Liaoning Province ':
      Echo ' Shenyang, Dalian, Tieling, Dandong, Jinzhou ';
      break;
    Case ' Jilin Province ':
      Echo ' Changchun, Songyuan, Jilin, Tonghua, Siping ';
      break;
  The server-side response is a string
?>

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