How to use php aggregate iterator

This article mainly introduces the relevant knowledge of "how to use php aggregate iterator". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use php aggregation iterator" can help you solve the problem.

Description

1. The interface to implement other iterator functions is equivalent to installing a shell on other iterators. There is only one way.

2. Aggregate iterators can be combined with many iterators to achieve more efficient iterations.

Example

Class MainIterator implements Iterator {private $var = array (); public function _ _ construct ($array) / / constructor to initialize the object array {if (is_array ($array)) {$this- > var = $array;}} public function rewind () {echo "rewinding\ n"; reset ($this- > var) / / point the inner pointer of the array to the first unit} public function current () {$var = current ($this- > var); / / return the current value in the array echo "current: $var\ n"; return $var;} public function key () {$var = key ($this- > var) / / returns the key name of the current cell pointed to by the internal pointer in the array echo "key: $var\ n"; return $var;} public function next () {$var = next ($this- > var); / / returns the value of the next cell pointed to by the internal pointer to the array echo "next: $var\ n"; return $var } public function valid () {return! is_null (key ($this- > var); / / determine whether the key of the current unit is empty}} that's all for "how to use the php aggregator iterator". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.