| 1 | <?php  | 
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| 20 | class Version20160823215458RemoveKnpMenuTemplate extends AbstractMigration implements ContainerAwareInterface  | 
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| 21 | { | 
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| 22 | /**  | 
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| 23 | * @var Filesystem  | 
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| 24 | */  | 
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| 25 | protected $fs;  | 
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| 26 | |||
| 27 | /**  | 
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| 28 | * @var string  | 
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| 29 | */  | 
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| 30 | protected $tpl;  | 
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| 31 | |||
| 32 | /**  | 
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| 33 | * @param ContainerInterface $container  | 
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| 34 | */  | 
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| 35 | public function setContainer(ContainerInterface $container = null)  | 
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| 40 | |||
| 41 | /**  | 
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| 42 | * @param Schema $schema  | 
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| 43 | */  | 
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| 44 | public function up(Schema $schema)  | 
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| 48 | |||
| 49 | /**  | 
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| 50 | * @param Schema $schema  | 
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| 51 | */  | 
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| 52 | public function down(Schema $schema)  | 
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| 56 | }  | 
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| 57 | 
If a variable is not always an object, we recommend to add an additional type check to ensure your method call is safe: