Fix PHP 7.2 warnings on count() use (#5845)

CHANGELOG

@@ -41,6 +41,7 @@ CHANGELOG Roundcube Webmail
 - Fix position of selected icon for (Mailvelope) Encrypt button
 - Fix fatal error when using DMY- or MDY-based date format in PostgreSQL (#5808)
 - Fix bug where errors were not printed when using bin/update.sh (#5834)
+- Fix PHP 7.2 warnings on count() use (#5845)
 
 RELEASE 1.3.0
 -------------

program/lib/Roundcube/rcube_contacts.php

@@ -364,7 +364,7 @@ class rcube_contacts extends rcube_addressbook
             // count result pages
             $cnt   = $this->count()->count;
             $pages = ceil($cnt / $this->page_size);
-            $scnt  = count($post_search);
+            $scnt  = !empty($post_search) ? count($post_search) : 0;
 
             // get (paged) result
             for ($i=0; $i<$pages; $i++) {

program/lib/Roundcube/rcube_db_oracle.php

@@ -133,7 +133,7 @@ class rcube_db_oracle extends rcube_db
         $idx  = 0;
         $args = array();
 
-        if (count($params)) {
+        if (!empty($params)) {
             while ($pos = strpos($query, '?', $pos)) {
                 if ($query[$pos+1] == '?') {  // skip escaped '?'
                     $pos += 2;

program/lib/Roundcube/rcube_imap_generic.php

@@ -1250,7 +1250,7 @@ class rcube_imap_generic
         }
 
         list($code, $response) = $this->execute('STATUS', array($this->escape($mailbox),
-            '(' . implode(' ', (array) $items) . ')'));
+            '(' . implode(' ', $items) . ')'));
 
         if ($code == self::ERROR_OK && preg_match('/^\* STATUS /i', $response)) {
             $result   = array();
@@ -1263,11 +1263,11 @@ class rcube_imap_generic
             if (!is_array($items) && ($pos = strpos($response, '(')) !== false) {
                 $response = substr($response, $pos);
                 $items    = $this->tokenizeResponse($response, 1);
+            }
 
             if (!is_array($items)) {
                 return $result;
             }
-            }
 
             for ($i=0, $len=count($items); $i<$len; $i += 2) {
                 $result[$items[$i]] = $items[$i+1];

program/lib/Roundcube/rcube_plugin_api.php

@@ -435,6 +435,7 @@ class rcube_plugin_api
         array_push($this->exec_stack, $hook);
 
         // Use for loop here, so handlers added in the hook will be executed too
+        if (!empty($this->handlers[$hook])) {
             for ($i = 0; $i < count($this->handlers[$hook]); $i++) {
                 $ret = call_user_func($this->handlers[$hook][$i], $args);
                 if ($ret && is_array($ret)) {
@@ -445,6 +446,7 @@ class rcube_plugin_api
                     break;
                 }
             }
+        }
 
         array_pop($this->exec_stack);
         return $args;