How to execute a wordpress function inside custom PHP file

Question

Inside my active theme there is a user.php which serves this kind of url http://mysite.com/user/username. Inside user.php I echo a script tag with the following content

$.ajax({ url: "' . get_theme_root_uri() . '/fray/userslogan.php",
                    data: {"id": ' . $profile['id'] . ', "slogan": el.innerHTML},
                    type: "post",
                    success: function(status) { alert(status); }                    
                });

I created a file userslogan.php and added it at the same level as user.php. Inside this file now all I want to do is

<?php
update_user_meta( $_POST['id'], 'slogan', $_POST['slogan'] );
echo 1;
?>

but I get errors that functions that I call are undefined. So if I include some file that defines the update_user_meta function, then I will get another similar error and so on. What is the right way of executing code like this?

You should not use own files to make ajax calls you should do it the WordPress way: codex.wordpress.org/AJAX_in_Plugins — janw
– janw, Commented Sep 27, 2013 at 9:41

janw · Accepted Answer · 2013-09-27 09:42:45Z

4

You need to include wp-load.php to get access to the wordpress function in custom files.

Suggestion: Don’t include wp-load, please. Use ajax in wordpress in proper way. You can refer this article.

From above article

Why this is wrong

You don’t have the first clue where wp-load.php actually is. Both the plugin directory and the wp-content directory can be moved around in the installation. ALL the WordPress files could be moved about in this manner, are you going to search around for them?

You’ve instantly doubled the load on that server. WordPress and the PHP processing of it all now have to get loaded twice for every page load. Once to produce the page, and then again to produce your generated javascript.

You’re generating javascript on the fly. That’s simply crap for caching and speed and such.

edited Sep 27, 2013 at 9:42

janw

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answered Sep 27, 2013 at 8:38

Konsole

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Comments

Banti · Accepted Answer · 2014-02-25 10:25:27Z

Try WP AJAX

1) http://codex.wordpress.org/Plugin_API/Action_Reference/wp_ajax_(action)

2) http://codex.wordpress.org/AJAX_in_Plugins

add_action( 'admin_footer', 'my_action_javascript' );

function my_action_javascript() {
    ?>
    <script type="text/javascript" >
    jQuery(document).ready(function($) {

    var data = {
    action: 'my_action',
    whatever: 1234
    };

    // since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php
        $.post(ajaxurl, data, function(response) {
    alert('Got this from the server: ' + response);
    });
  });
  </script>
  <?php
  }

  add_action('wp_ajax_my_action', 'my_action_callback');

   function my_action_callback() {
global $wpdb; // this is how you get access to the database

$whatever = intval( $_POST['whatever'] );

$whatever += 10;

    echo $whatever;

die(); // this is required to return a proper result
   }

Stephan Muller · Accepted Answer · 2013-09-27 08:35:50Z

0

You need to have the entire Wordpress codebase in there. Your best bet would be to make an actual Wordpress plugin, that's going to be a lot easier than this.

http://codex.wordpress.org/Writing_a_Plugin

answered Sep 27, 2013 at 8:35

Stephan Muller

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