What are the characteristics of PHP generator?

php editor Banana today introduces to you a very useful feature in PHP - Generator. Generator is a special iterator in PHP that allows us to process large amounts of data in a more efficient way, reduce memory consumption and improve performance. Through the yield keyword, Generator can implement lazy evaluation and only generate data when needed, avoiding loading all data into memory at once. This feature makes Generator perform well when processing large data collections, greatly improving the efficiency and maintainability of the code.

1. Lazy calculation: Generator allows to generate values ​​on demand instead of generating all values ​​at once. Each time a Generator is called, it generates a value and pauses execution, waiting for the next call.

2. Save memory: Since Generators generate values ​​on demand, they can greatly reduce memory consumption. Compared to generating all values ​​at once and storing them in an array in memory, Generator only stores the state information needed to generate the values.

Iterator interface: Generator implements the iterator interface of
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   so that it can be directly used in foreach loops. This makes it easy to iterate over the generated values.

Abortable: Generator can explicitly abort execution through the yield statement, thus providing greater flexibility. Abort can be used to stop generation early when the caller only needs part of the generated value.
State preservation: Generator maintains its internal state and can be restored correctly even when called between generating values. This means that the value of a local variable can be maintained between multiple calls to the Generator.
In general, PHP's Generator provides a more flexible and efficient way to generate values, which can save memory and reduce calculation time. They are particularly useful when working with large amounts of data or when values ​​need to be generated incrementally.

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