syntax error, unexpected token “,”, expecting variable or “$”¶

Description¶

This error is reported when a list of global variable is expected after the global keyword.

There is a similar case with the visibility options public, protected and private, and the static keyword, although global is the only keyword with accepts variable variables.

Generally speaking, there can be no two successive commas in an expression, except with the list() keyword.

Example¶

<?php

class X {
     public function foo() {
         global $a, , $c;
     }
}

?>

Solutions¶

Remove the extra comma.
Fill the empty slot with a variable.