PHP 5.3 backward compatibility

system/admin/admin.php

@@ -120,7 +120,11 @@ function add_content($title, $tag, $url, $content, $user, $draft, $category, $ty
 
     $post_date = date('Y-m-d-H-i-s');
     $post_title = safe_html($title);
-    $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media ?? ''));
+    if (defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION < 7) {
+        $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media));  
+    } else {
+        $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media ?? ''));    	
+    }
     $post_tag = strtolower(preg_replace(array('/[^a-zA-Z0-9,. \-\p{L}]/u', '/[ -]+/', '/^-|-$/'), array('', '-', ''), remove_accent($post_tag)));
     $post_url = strtolower(preg_replace(array('/[^a-zA-Z0-9 \-\p{L}]/u', '/[ -]+/', '/^-|-$/'), array('', '-', ''), remove_accent($url)));
     $description = safe_html($description);
@@ -260,7 +264,11 @@ function edit_content($title, $tag, $url, $content, $oldfile, $revertPost, $publ
     }
 
     $post_title = safe_html($title);
-    $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media ?? ''));
+    if (defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION < 7) {
+        $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media));  
+    } else {
+        $post_media = preg_replace('/\s\s+/', ' ', strip_tags($media ?? ''));    	
+    }
     $post_tag = strtolower(preg_replace(array('/[^a-zA-Z0-9,. \-\p{L}]/u', '/[ -]+/', '/^-|-$/'), array('', '-', ''), remove_accent($post_tag)));
     $post_url = strtolower(preg_replace(array('/[^a-zA-Z0-9 \-\p{L}]/u', '/[ -]+/', '/^-|-$/'), array('', '-', ''), remove_accent($url)));
     $description = safe_html($description);

system/includes/functions.php

@@ -570,8 +570,14 @@ function get_category_info($category)
         }
     }
 
-    if (strtolower($category ?? '') == 'uncategorized') {
-        return default_category();
+    if (defined('PHP_MAJOR_VERSION') && PHP_MAJOR_VERSION < 7) {
+        if (strtolower($category) == 'uncategorized') {
+            return default_category();
+        }   
+    } else {
+        if (strtolower($category ?? '') == 'uncategorized') {
+            return default_category();
+        }
     }
 
     return $tmp;