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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace DoctrineMigrations;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\DBAL\Schema\Schema;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\Migrations\AbstractMigration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class Version20210425203036 extends AbstractMigration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private const DATA = __DIR__.'/data/performances_duration_producers_age_limits.csv';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function getDescription() : string  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return 'Added: performance age limit data, performance producer field with data, performance len with data';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function up(Schema $schema) : void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->addSql('ALTER TABLE performances ADD producer_id INT DEFAULT NULL, ADD durationInMin INT NOT NULL, ADD extProducer VARCHAR(255) DEFAULT NULL'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->addSql('ALTER TABLE performances ADD CONSTRAINT FK_8133AB2B89B658FE FOREIGN KEY (producer_id) REFERENCES employees (id)'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->addSql('CREATE INDEX IDX_8133AB2B89B658FE ON performances (producer_id)'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->insertData();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function down(Schema $schema) : void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function insertData()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $performances = array_map('str_getcsv', file(self::DATA)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        array_shift($performances); // remove headers  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($performances as $performance) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $slug = array_shift($performance);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $title = array_shift($performance);  | 
            
                            
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                            $link = array_shift($performance);  | 
            
                            
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                            $ageLimit = array_shift($performance);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $producer = array_shift($performance);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $len = array_shift($performance);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $inHouseProducer = $this->connection->fetchAssociative(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'SELECT id FROM employees WHERE lastName LIKE :lastName',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ['lastName' => '%'.trim(explode(' ', $producer)[0]).'%'] | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($inHouseProducer) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->addSql(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    'UPDATE performances SET durationInMin=:len, ageLimit=:ageLimit, producer_id=:producer WHERE slug=:slug',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    ['len' => (int) $len, 'ageLimit' => (int) $ageLimit, 'producer' => $inHouseProducer['id'], 'slug' => $slug]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                continue;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->addSql(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'UPDATE performances SET durationInMin=:len, ageLimit=:ageLimit, extProducer=:producer WHERE slug=:slug',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                ['len' => (int) $len, 'ageLimit' => (int) $ageLimit, 'producer' => $producer, 'slug' => $slug]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.