PHP gets array random subscript key of the previous prev and next next subscript value

PHP gets the previous prev and next next subscript value of an array of arbitrary subscript keys

PHP gets the previous prev and next next subscript value of an array of arbitrary subscript keys

 $value) {$steps->add ($key);} $steps->setcurrent (3);//parameter is the key value Echo ' previous subscript: '. $steps->getprev (). "
"; Echo ' specifies the subscript: '. $steps->getcurrent ()."
"; Echo ' next subscript: '. $steps->getnext ()."
"; class Steps {private $all;    Private $count;     Private $curr;    function __construct () {$this->count = 0;        } function Add ($step) {$this->count++;    $this->all[$this->count] = $step;        } function Setcurrent ($step) {reset ($this->all);            for ($i = 1; $i <= $this->count; $i + +) {if ($this->all[$i] = = $step) break;        Next ($this->all);    } $this->curr = current ($this->all);    } function GetCurrent () {return $this->curr;        } function GetNext () {self::setcurrent ($this->curr);    Return next ($this->all);        } function GetPrev () {self::setcurrent ($this->curr);    Return prev ($this->all); }}

Printing results:

Previous subscript: 2 subscript specified: 3 Next subscript: 4

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