| 1 | <?php  | 
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| 7 | trait UuidTrait  | 
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| 8 | { | 
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| 9 | /**  | 
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| 10 | * @var string Primary key UUID  | 
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| 11 | *  | 
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| 12 | * @ORM\Id  | 
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| 13 | * @ORM\Column(type="string")  | 
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| 14 | * @ORM\GeneratedValue(strategy="UUID")  | 
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| 15 | */  | 
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| 16 | protected $id;  | 
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| 17 | |||
| 18 | /**  | 
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| 19 | * Return primary key UUID identifier.  | 
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| 20 | *  | 
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| 21 | * @return string Primary key UUID  | 
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| 22 | */  | 
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| 23 | public function getId()  | 
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| 27 | |||
| 28 | /**  | 
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| 29 | * Sets primary key UUID identifier.  | 
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| 30 | *  | 
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| 31 | * @param string $id Primary key UUID  | 
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| 32 | *  | 
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| 33 | * @return UuidTrait  | 
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| 34 | */  | 
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| 35 | public function setId($id)  | 
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| 41 | }  | 
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| 42 | 
In PHP traits cannot be used for type-hinting as they do not define a well-defined structure. This is because any class that uses a trait can rename that trait’s methods.
If you would like to return an object that has a guaranteed set of methods, you could create a companion interface that lists these methods explicitly.