Question

How do I execute PHP using a JavaScript onclick button?
I can get the form to submit, but the PHP does not get executed. I assume it’s because if(isset($_POST['form']))

Here is the PHP I want to execute:

if(isset($_POST['form']))
{
    if(!isset($error))
    {
        $database->query('UPDATE table SET field = :value WHERE id = :id', array(':field' => $value, ':id' => $id));
    }
}

Here is my button that is BEFORE my <form> tag:

<div onclick="javascript: $(\'#form\').submit();">Update</div>

And of course my <form> tag looks something like this:

<form name="form" id="form" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
  <select name="value">
    <option value="1">Value1</option>
    <option value="2">Value2</option>
    <option value="3">Value3</option>
  </select>
</form>

Answer 1

PHP generally runs server side. JavaScript generally runs in the browser. You need to put the PHP in the file blah.php on the server.