I want to create a directory class, and I want it to function as an iterator (foreach-able). But I want it to be generator based (for example a function that does "yield"). Is it possible?
2条回答 默认 最新
- dswsl2016 2013-02-23 15:46关注
There is not an interface explicitly for classes to implement generators, but you can make use of
IteratorAggregate
here.See this example of implementing
IteratorAggregate
from the Generators RFCclass Test implements IteratorAggregate { protected $data; public function __construct(array $data) { $this->data = $data; } public function getIterator() { foreach ($this->data as $key => $value) { yield $key => $value; } // or whatever other traversation logic the class has } } $test = new Test(['foo' => 'bar', 'bar' => 'foo']); foreach ($test as $k => $v) { echo $k, ' => ', $v, " "; }
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