How do I get variables from PHP through AJAX?

A2A Write a function in php which prints the value of the variable. Call that function using AJAX

There is a much simpler way to handle getting variables from PHP through AJAX by using the jQuery framework. I'll use your example, action.php. $.post("action.php", { }, onAction); Using jQuery post, you ask your PHP script, action.php, to give you a value. You would only need to use Javascript Object Notation (JSON), if you needed to get multiple variables in an array of sorts. Since you're not passing any information to your script, I have left the second parameter an empty array. function onAction(output) {   alert(output); } This function will receive the output from your script and show it in a Javascript popup. <?php $a=$b[0]; echo $a; ?> In your action.php script, you would just need to echo the variable, which gets passed via AJAX to the Javascript function onAction. I hope this helps. Thanks.

First make sure it's the only data on the page then echo $a is enough or you can try to convert it to json: echo json_encode(['a' => $a]); and in js you get it by: data.a where data is the result of ajax request.

Hello. This is the ajax script part of the html document: <script type="text/javascript">     $.ajax({         url: "index.php",         dataType: "text",         type: "POST",         timeout: 20000,         cache: false,         data: {             action : 'give me that'         }     })     .done(function(data,textStatus,jqXHR){         alert("index.php response with: " + data);     })     .fail(function(data,textStatus,errorThrown){ alert("Request failed!"); })     .always(function(data,textStatus,errorThrown){}); </script> This is the "index.php" file: <?php     header('Content-Type: text/plain; charset=UTF-8;');     $a = $b[0];     if (TRUE == isset($_POST['action'])) {         echo "this is the content of variable php $a: " . $a;     } ?> In this ajax setup, the browser will send a request to the file "index.php" on the server using method POST with variable "action" with content "give me that". In a form of a text, the server will response "this is the content of variable php $a: " including the content of $a. Highly recommend to read the documentation about jquery ajax methods on http://api.jquery.com/category/ajax/

I created a action.php page that has a array $a with various indices value set and its value can be queried by GET/POST method using AJAX request. It returns a json string with status either success or failure according to index value queried by user and its value, if found. PHP Script [code] <?php   class retObj{     var $status;     var $value;     function __construct($st, $v=null){       $this->status = $st;       $this->value = $v;    } } $a = array(           1 => 'value 1',          5 => 70         ); if(isset($_GET['id']) && strlen($_GET['id'])){      $id = $_GET['id'];      if(isset($a[$id])){          echo json_encode(new retObj('Success', $a[$id]));      } else{          echo json_encode(new retObj('Failure'));      } } else{         echo json_encode(new retObj('Failure')); } ?> [/code] Javascript jQuery(window).load(function(){ var id = 5 //index value to query for jQuery.ajax({ type: "POST", url: "action.php?id="+id, dataType: "json", success: function(result){ if(result.status == "Success"){ console.log(result.value) // displays found value on console } else{ console.log('Error: No such variable value present') } }, error:function(){ console.log("Error: Unknown Error") } }) }) Hope this helps :)

Hi Raj, In your action.php assign $a value to input tag say named "a" (id="a"); Ajax code in action.php will be get the value of  "a" and sends it to index.php $.ajax({ type: "POST", url: "index.php", data: { "aValue": $("#a").val() }, dataType: 'json' success: function() { } }); In index.php the value of a should be accessible as $_POST['a'].

$.ajax( {   url : 'action.php',   type: "POST",   data : $('#editForm').serialize(),   success:function(response)    {                 if(response == '1'){                               }    } }); In your action.php file, get values by using $_POST['variable_name']. Hope this helps.