Fix: Add return type declarations (#865)

Author: localheinz

images/supported-versions.php

@@ -27,12 +27,14 @@ function branches_to_show() {
     return $branches;
 }
 
-function min_date() {
+function min_date(): DateTime
+{
     $now = new DateTime('January 1');
     return $now->sub(new DateInterval('P3Y'));
 }
 
-function max_date() {
+function max_date(): DateTime
+{
     $now = new DateTime('January 1');
     return $now->add(new DateInterval('P5Y'));
 }

include/branches.inc

@@ -286,7 +286,8 @@ function get_final_release($branch) {
     return null;
 }
 
-function get_branch_bug_eol_date($branch) {
+function get_branch_bug_eol_date($branch): ?DateTime
+{
     if (isset($GLOBALS['BRANCHES'][$branch]['stable'])) {
         return new DateTime($GLOBALS['BRANCHES'][$branch]['stable']);
     }
@@ -296,7 +297,8 @@ function get_branch_bug_eol_date($branch) {
     return $date ? $date->add(new DateInterval('P2Y')) : null;
 }
 
-function get_branch_security_eol_date($branch) {
+function get_branch_security_eol_date($branch): ?DateTime
+{
     if (isset($GLOBALS['BRANCHES'][$branch]['security'])) {
         return new DateTime($GLOBALS['BRANCHES'][$branch]['security']);
     }
@@ -313,7 +315,8 @@ function get_branch_security_eol_date($branch) {
     return $date ? $date->add(new DateInterval('P3Y')) : null;
 }
 
-function get_branch_release_date($branch) {
+function get_branch_release_date($branch): ?DateTime
+{
     $initial = get_initial_release($branch);
 
     return $initial ? new DateTime($initial['date']) : null;