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Editorial Team
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Asked: 2026-05-31T22:35:18+00:00

I am trying some things with JSON and PHP and there is something that

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I am trying some things with JSON and PHP and there is something that I can’t find a way to do, though I’m not 100% sure there is one. But because it looks like a nice option (If possible) I decided to ask here.

I have these examples from jquery offical site. There are two files, the first one is index.php where I execute my Ajax, hete it is:

<!DOCTYPE html>
<html>
<head>
<title>Simple form sending and receiving a JSON object to/from PHP</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

<script type="text/javascript">
$(document).ready(function(){ 
  var data = 
  { 
    "sales": [ 
      { "firstname" : "John", "lastname" : "Brown" },
      { "firstname" : "Marc", "lastname" : "Johnson" }
    ] // end of sales array
  }
  var dataString = JSON.stringify(data);
  $.post('simpleformSubmi.php', { data: dataString}, showResult, "text");
});

function showResult(res)
{
  $("#fullresponse").html("Full response: " +res);
}
</script>
<div id="fullresponse"></div>
</head>
<body>

Nothing complicated at all. And I have my simpleformSubmi.php which is :

<?php

$logFile = 'logFile';
$res = json_decode(stripslashes($_POST['data']), true);
error_log("result: ".$_POST['data'].", res=".json_encode($res), 3, $logFile);
error_log("\n", 3, $logFile);

//header("Content-type: text/plain");
foreach ($res as $key=>$value)
{
    $str[] = $value;
}
$functionArray ="function(){ \$a = 10; echo \$a;}";
$jsStr = $str[0][1];
echo json_encode($jsStr['firstname']);
echo '<hr />';
echo json_encode($res);
echo '<hr />';
echo json_encode($functionArray);
?>

As you can see $functionArray – is in fact a string containing PHP function which I want to return back using JSON and to execute it after that. So is there any way to do that really? Now what I get in index.php afet executing the files is:

"function(){ $a = 10; echo $a;}“

Thanks
Lern

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1 Answer

  1. Editorial Team

    Seems like you’re trying to execute a PHP function through JavaScript. Since PHP is executed server-side the only way you have to execute a PHP function in that context is to ask the server back to execute the function for you, by doing another ajax call for example.

    Something like this:

    index.php

    $(document).ready(function(){ 
  var data = 
  { 
    "sales": [ 
      { "firstname" : "John", "lastname" : "Brown" },
      { "firstname" : "Marc", "lastname" : "Johnson" }
    ] // end of sales array
  }
  var dataString = JSON.stringify(data);

  //Change post() success callback function to executePHP()
  $.post('simpleformSubmi.php', { data: dataString}, executePHP, "text");

  //Let's define executePHP() outside post() call for clarity
  function executePHP()
  {
      //Ask the server to execute function foo(), and get the result
      $.get("example.com/somefile.php?function=foo", function(data)
      {
          //Success function, do whatever you want.
          alert(data);
      });
  }
});

    Then, in somefile.php

    <?php
//Condition(s), if any. You could even implement this interface using REST.
//Get function to execute
if($_GET["function"] == "foo")
{
    //Output function's result.
    echo foo();
}

//The function you want to run
function foo()
{
    //Do something
    $a = 10;
    return $a;
}
?>

    If all went well, when JavaScript reaches the alert(data); statement you will see 10.

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