Cannot understand this php parser error

Question

Why does this give me parse error? going crazy over here..

I have this file right:

function start_connection() {

 global $config['db_host'];

}

Parse error: parse error, expecting ','' or ';'' in functions.php on line 5

Answer 1

when declaring the global variable do not include the array key, so:

global $config;

this will provide access to all key => value pairs within $config array within the function start_connection().

Answer 2

You can't global an array within a variable. Only the variable.

Answer 3

just do:

function start_connection() {
 global $config;
 echo $config['db_host'];
}

You can only use global variables, but not a specific value of a array.