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

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

http://www.bkjia.com/PHPjc/815135.html www.bkjia.com true http://www.bkjia.com/PHPjc/815135.html techarticle PHP gets an array of arbitrary subscript keys on the previous prev and next next subscript $value) {$steps->add ($key);} $steps->setcurrent (3);//parameter is key value echo previous subscript:. $steps->getprev (). " ...

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