When i try and activate my custom plugin i get the error shown below but this makes no sense to me as it seems ok code wise.

Fatal error: Class 'Functionality\AlterTable\AlterTableComments' not found in C:\wamp64\www\wp-content\plugins\functionality\example.php on line 130

incase your wondering this is on line 130:

new AlterTableComments;
  • This simply means the class you are trying to initiate is not defined. Did you write the plugin yourself?
    – Johansson
    Apr 18, 2018 at 18:47
  • try to use class name with namespace prefix $a = '\namespacename\classname'; $obj = new $a; see php.net/manual/en/language.namespaces.dynamic.php Apr 19, 2018 at 6:14
  • $a = '\PethouseukFunctionality\AlterTable\AlterTableComments'; $obj = new $a; Apr 19, 2018 at 9:11
  • Add code snippet to your question if possible. Apr 19, 2018 at 9:57

1 Answer 1


What I conclude form your comments is pethouseuk-functionality.php

include 'AlterTableComments.php';

use PethouseukFunctionality\AlterTable;

$a = 'PethouseukFunctionality\AlterTable\test';
$a();  // function call

$b = 'PethouseukFunctionality\AlterTable\AlterTableComments';
$c = new $b; // new object

$c->yourfunction('test'); // Method call

Another file AlterTableComments.php


namespace PethouseukFunctionality\AlterTable;

interface AlterTableInterface{

    function yourfunction($param);


class AlterTableComments implements AlterTableInterface{
    function yourfunction($param){

function test(){
    echo 'this is test ';

Result: this is test string(4) "test"


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