php迭代器
Posted 2016
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<?php class Fibonacci implements Iterator { private $previous = 1; private $current = 0; private $key = 0; public function current() { return $this->current; } public function key() { return $this->key; } public function next() { // 将当前值保存到 $newprevious $newprevious = $this->current; // 将上一个值与当前值的和赋给当前值 $this->current += $this->previous; // 前一个当前值赋给上一个值 $this->previous = $newprevious; $this->key++; } public function rewind() { $this->previous = 1; $this->current = 0; $this->key = 0; } public function valid() { return true; } } $seq = new Fibonacci; $i = 0; foreach ($seq as $f) { echo $f, ‘<br>‘; if ($i++ === 15) break; }
原理:http://www.nowamagic.net/librarys/veda/detail/2161
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