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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace dokuwiki\Subscriptions;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class MediaSubscriptionSender extends SubscriptionSender  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Send the diff for some media change  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @fixme this should embed thumbnails of images in HTML version  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string   $subscriber_mail The target mail address  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string   $template        Mail template ('uploadmail', ...) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string   $id              Media file for which the notification is  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param int|bool $rev             Old revision if any  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function sendMediaDiff($subscriber_mail, $template, $id, $rev = false)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        global $conf;  | 
            
            
                                                        
            
                                    
            
            
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                        $file = mediaFN($id);  | 
            
            
                                                        
            
                                    
            
            
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                        list($mime, /* $ext */) = mimetype($id);  | 
            
            
                                                        
            
                                    
            
            
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                        $trep = [  | 
            
            
                                                        
            
                                    
            
            
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                            'MIME' => $mime,  | 
            
            
                                                        
            
                                    
            
            
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                            'MEDIA' => ml($id, '', true, '&', true),  | 
            
            
                                                        
            
                                    
            
            
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                            'SIZE' => filesize_h(filesize($file)),  | 
            
            
                                                        
            
                                    
            
            
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                        ];  | 
            
            
                                                        
            
                                    
            
            
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                        if ($rev && $conf['mediarevisions']) { | 
            
            
                                                        
            
                                    
            
            
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                            $trep['OLD'] = ml($id, "rev=$rev", true, '&', true);  | 
            
            
                                                        
            
                                    
            
            
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                        } else { | 
            
            
                                                        
            
                                    
            
            
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                            $trep['OLD'] = '---';  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        $headers = ['Message-Id' => $this->getMessageID($id, @filemtime($file))];  | 
            
            
                                                        
            
                                    
            
            
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                        if ($rev) { | 
            
            
                                                        
            
                                    
            
            
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                            $headers['In-Reply-To'] = $this->getMessageID($id, $rev);  | 
            
                            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        $this->send($subscriber_mail, 'upload', $id, $template, $trep, null, $headers);  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: