Enables an object to be a foreach loop like an array, requiring that the property be private

1Iteratorextendstraversable {2 /*Methods*/3 Abstract  Public Mixed  Current(void)4 Abstract  PublicScalarKey(void)5 Abstract  PublicvoidNext(void)6 Abstract  PublicvoidRewind(void)7 Abstract  Public Booleanvalid (void)8}

Therefore, for this question, the following answers can be made:

1 classSampleImplementsIterator2 {3     Private $_items=Array(1,2,3,4,5,6,7);4      Public function__construct () {5;//void6     }7      Public function Rewind() {Reset($this-_items); }8      Public function  Current() {return  Current($this-_items); }9      Public function Key() {return Key($this-_items); }Ten      Public function Next() {return Next($this-_items); } One      Public functionValid () {return($this- Current() !==false ); } A } - $sa=Newsample (); - foreach($sa  as $key=$val){ the     Print $key. "=".$val; -}

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PHP5 already has the iterator interface, as long as the implementation of the interface, that is, you can implement the object private property is foreach traversal

1<?PHP2 classSampleImplementsiterator{3 Private $var=Array(1,2,3,4,5);4  　　  Public function__construct () {}5  　　  Public function Rewind(){Reset($this-var);}6  　　  Public function  Current(){return  Current($this-var);}7  　　  Public function Key(){return Key($this-var);}8  　　  Public function Next(){return Next($this-var);}9  　　  Public functionValid () {return($this- Current()!==false);}Ten } One $s=NewSample (); A foreach($s  as $k=$v){Echo $k.‘ = '.$v.‘ <br/> ';} -?>

Enables an object to be a foreach loop like an array, requiring that the property be private