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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Volan;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Psr\Log\LoggerInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class InMemoryLogger implements LoggerInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var null|resource  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $stream = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $filename = "php://memory";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $fp = fopen($filename, "w+b");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->stream = $fp;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function info($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        fwrite($this->stream, (string)$message . "\n");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function warning($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('WARNING: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function debug($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('DEBUG: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function critical($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('CRITICAL: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function emergency($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('EMERGENCY: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function error($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('ERROR: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function alert($message, array $context = array())  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->info('ALERT: ' . $message, $context); | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function notice($message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info('NOTICE: ' . $message, $context); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function log($level, $message, array $context = array())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->info($message, $context);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getLog()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        rewind($this->stream);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return stream_get_contents($this->stream);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                // Works  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
                            
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                $filename = "php://memory";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                $fp = fopen($filename, "w+b");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                fwrite($fp, 'hi');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                fwrite($fp, 'dude');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                rewind($fp);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                var_dump(stream_get_contents($fp));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                fwrite($fp, 'dude');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                rewind($fp);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                var_dump(stream_get_contents($fp));  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                */  | 
            
            
                                                        
            
                                    
            
            
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Sometimes obsolete code just ends up commented out instead of removed. In this case it is better to remove the code once you have checked you do not need it.
The code might also have been commented out for debugging purposes. In this case it is vital that someone uncomments it again or your project may behave in very unexpected ways in production.
This check looks for comments that seem to be mostly valid code and reports them.