First create global variables (in functions.php or as a mu-plugin):
<?php
/*
* CUSTOM GLOBAL VARIABLES
*/
function wtnerd_global_vars() {
global $wtnerd;
$wtnerd = array(
'edition' => get_query_var('category_name'),
'channel' => get_query_var('channel'),
'tag' => get_query_var('tag'),
);
}
add_action( 'parse_query', 'wtnerd_global_vars' );Why are we using an associative array variable $wtnerd? Because global variables need to be unique, and by keeping $wtnerd unique we can have simpler names for all the variables in its array.
By the way, the same can also be done like this:
<?php
/*
* CUSTOM GLOBAL VARIABLES
*/
function wtnerd_global_vars() {
global $wtnerd;
$wtnerd['edition'] = get_query_var('category_name');
$wtnerd['channel'] = get_query_var('channel');
$wtnerd['tag'] = get_query_var('tag');
}
add_action( 'parse_query', 'wtnerd_global_vars' );Then use $GLOBALS[]; to call the variable elsewhere (another file):
<?php
if( $GLOBALS['wtnerd']['edition'] == uk ) {
// Do something
}If the function in which you are defining the global variables is not hooked into a filter or action, e.g. add_action( 'parse_query', 'wtnerd_global_vars' ); as we are doing above, then you should do it as shown below.
In functions.php or mu-plugin:
<?php
/*
* CUSTOM GLOBAL VARIABLES
*/
function wtnerd_global_vars() {
global $wtnerd;
$wtnerd = array(
'edition' => get_query_var('category_name'),
'channel' => get_query_var('channel'),
'tag' => get_query_var('tag'),
);
}Then, to call the variable elsewhere (another file), you need to manually initialize the function before you can use the variable:
<?php
wtnerd_global_vars();
if( $GLOBALS['wtnerd']['edition'] == uk ) {
// Do something
}