O bien, modificando el php.ini
Cita:
Iniciado por php.ini ;;;;;;;;;;;;;;;;;
; Data Handling ;
;;;;;;;;;;;;;;;;;
; The separator used in PHP generated URLs to separate arguments.
; PHP's default setting is "&".
;
http://php.net/arg-separator.output
; Example:
;arg_separator.output = "&"
; List of separator(s) used by PHP to parse input URLs into variables.
; PHP's default setting is "&".
; NOTE: Every character in this directive is considered as separator!
;
http://php.net/arg-separator.input
; Example:
;arg_separator.input = ";&"