Ajax implements the method of calling the return php interface to return json data-PHP Tutorial-php.cn

Ajax implements the method of calling the return php interface to return json data

墨辰丷

Release： 2023-03-27 15:24:02

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This article mainly introduces the method of ajax implementing the call to return the php interface to return json data. Interested friends can refer to it. I hope it will be helpful to everyone.

php code is as follows:

<?php

  header(&#39;Content-Type: application/json&#39;);
  header(&#39;Content-Type: text/html;charset=utf-8&#39;);

  $email = $_GET[&#39;email&#39;];

  $user = [];

  $conn = @mysql_connect("localhost","Test","123456") or die("Failed in connecting database");
  mysql_select_db("Test",$conn);
  mysql_query("set names &#39;UTF-8&#39;");
  $query = "select * from UserInformation where email = &#39;".$email."&#39;";
  $result = mysql_query($query);
  if (null == ($row = mysql_fetch_array($result))) {
    echo $_GET[&#39;callback&#39;]."(no such user)";
  } else {
    $user[&#39;email&#39;] = $email;
    $user[&#39;nickname&#39;] = $row[&#39;nickname&#39;];
    $user[&#39;portrait&#39;] = $row[&#39;portrait&#39;];
    echo $_GET[&#39;callback&#39;]."(".json_encode($user).")";
  }

?>

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js code is as follows :

<script>
    $.ajax({
      url: "http://test.localhost/UserInterfaceForChatroom/UserInformation.php?email=pshuyue@gmail.com",
      type: "GET",
      dataType: &#39;jsonp&#39;,
      //      crossDomain: true,
      success: function (result) {
        //        data = $.parseJSON(result);
        //        alert(data.nickname);
        alert(result.nickname);
      }
    });
  </script>

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Two problems were encountered:

1. The first question:

Uncaught SyntaxError: Unexpected token :

The solution is as follows:

This has just happened to me, and the reason was none of the reasons above. I was using the jQuery command getJSON and adding callback=? to use JSONP (as I needed to go cross-domain), and returning the JSON code {"foo":"bar"} and getting the error.

This is because I should have included the callback data, something like jQuery17209314005577471107_1335958194322({"foo":"bar"})

Here is the PHP code I used to achieve this, which degrades if JSON (without a callback) is used:

$ret[&#39;foo&#39;] = "bar";
finish();

function finish() {
  header("content-type:application/json");
  if ($_GET[&#39;callback&#39;]) {
    print $_GET[&#39;callback&#39;]."(";
  }
  print json_encode($GLOBALS[&#39;ret&#39;]);
  if ($_GET[&#39;callback&#39;]) {
    print ")";
  }
  exit; 
}

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Hopefully that will help someone in the future.

2. The second question:

Parse json data. As you can see from the above javascript, I did not use the jquery.parseJSON() methods. I started using these methods, but I always reported

VM219:1 Uncaught SyntaxError: Unexpected token o in JSON at position 1. error, but later I didn’t use the jquery.parseJSON() method, but everything went fine. Do not know why.

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