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src/leetcode/ImplementStrstr.php (4 issues)

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<?php
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declare(strict_types=1);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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namespace leetcode;

            


            
                                                        
            
                                    
            
            

                
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class ImplementStrstr

            


            
                                                        
            
                                    
            
            

                
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{

            


            
                                                        
            
                                    
            
            

                
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    public static function strstr(string $haystack, string $needle): int

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                        
                        

                            
                            
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            Unused Code
    
    
    
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The parameter $haystack is not used and could be removed.
                                                                                   (
                                     Ignorable by Annotation
                                )
                                

                                    
 If this is a false-positive, you can also ignore this issue in your code via the ignore-unused   annotation

                                    

                                        

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    public static function strstr(/** @scrutinizer ignore-unused */ string $haystack, string $needle): int

                                        

                                                                            

                                

                                                                                                                            

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
This check looks for parameters that have been defined for a function or method, but which
are not used in the method body.


                        

                                                    

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            Unused Code
    
    
    
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The parameter $needle is not used and could be removed.
                                                                                   (
                                     Ignorable by Annotation
                                )
                                

                                    
 If this is a false-positive, you can also ignore this issue in your code via the ignore-unused   annotation

                                    

                                        

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    public static function strstr(string $haystack, /** @scrutinizer ignore-unused */ string $needle): int

                                        

                                                                            

                                

                                                                                                                            

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
This check looks for parameters that have been defined for a function or method, but which
are not used in the method body.


                        

                                                    

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    {

            


            
                                                        
            
                                    
            
            

                
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        $ans = -1;

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                        
                        

                            
                            
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The assignment to $ans is dead and can be removed.
                                                                                                

                    
                                                    

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In this branch, the function will implicitly return null which is incompatible with the type-hinted return integer. Consider adding a return statement or allowing null as return value.
                                                                                                

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
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:


interface ReturnsInt {
    public function returnsIntHinted(): int;
}

class MyClass implements ReturnsInt {
    public function returnsIntHinted(): int
    {
        if (foo()) {
            return 123;
        }
        // here: null is implicitly returned
    }
}





                        

                                                    

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    }

            


            
                                                        
            
                                    
            
            

                
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}

            


            
                                                        
            
                                    
            
            

                
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