fix php errors and deprecation warnings

Zotlabs/Photo/PhotoGd.php

@@ -17,11 +17,11 @@ class PhotoGd extends PhotoDriver {
 		$t = [];
 
 		$t['image/jpeg'] = 'jpg';
-		if(imagetypes() & IMG_PNG)
+		if(\imagetypes() & IMG_PNG)
 			$t['image/png'] = 'png';
-		if(imagetypes() & IMG_GIF)
+		if(\imagetypes() & IMG_GIF)
 			$t['image/gif'] = 'gif';
-		if(imagetypes() & IMG_WEBP)
+		if(\imagetypes() & IMG_WEBP)
 			$t['image/webp'] = 'webp';
 
 		return $t;

Zotlabs/Text/Tagadelic.php

@@ -24,7 +24,7 @@ class Tagadelic {
 			$x ++;
 		}
 
-		usort($tags,'self::tags_sort');
+		usort($tags, [self::class, 'tags_sort']);
 
 		$range = max(.01, $max - $min) * 1.0001;
 
@@ -41,4 +41,4 @@ class Tagadelic {
 		return((strtolower($a[0]) < strtolower($b[0])) ? -1 : 1);
 	}
 
-}
+}

Zotlabs/Zot6/Receiver.php

@@ -22,6 +22,7 @@ class Receiver {
 	protected $prvkey;
 	protected $rawdata;
 	protected $sigdata;
+	protected $hub;
 
 	function __construct($handler, $localdata = null) {
 

include/plugin.php

@@ -190,7 +190,7 @@ function reload_plugins() {
 	$plugins = get_config('system', 'addon');
 	if(strlen($plugins)) {
 		$r = dbq("SELECT * FROM addon WHERE installed = 1");
-		if(count($r))
+		if($r)
 			$installed = $r;
 		else
 			$installed = array();