| Conditions | 5 | 
| Paths | 5 | 
| Total Lines | 16 | 
| Code Lines | 8 | 
| Lines | 0 | 
| Ratio | 0 % | 
| Changes | 0 | ||
| 1 | <?php  | 
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| 28 | public function apply(ImageInterface $image): ImageInterface  | 
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| 29 |     { | 
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| 30 |         if ($this->quality === 'default') { | 
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| 31 | return $image;  | 
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| 32 | }  | 
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| 33 | |||
| 34 |         if ($this->quality === 'gray') { | 
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| 35 | return $image->greyscale();  | 
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| 36 | }  | 
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| 37 | |||
| 38 |         if ($this->quality === 'color') { | 
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| 39 | return $image;  | 
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| 40 | }  | 
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| 41 | |||
| 42 |         if ($this->quality === 'bitonal') { | 
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| 43 | return $image;  | 
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| 44 | }  | 
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| 47 | 
For hinted functions/methods where all return statements with the correct type are only reachable via conditions, ?null? gets implicitly returned which may be incompatible with the hinted type. Let?s take a look at an example: