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You can also check out this and all the next examples in this repository.
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This example uses the HTTP package, which provides the ability to consume and serve HTTP resources. The method get returns a Promise, an implementation of CommonJS Promises/A for PHP, which is provided by one of the ReactPHP packages - Promise.
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In this example we create an HttpServer object, which responds immediately to GET requests and, for any other HTTP methods, we defer the response for 2 whole seconds using the await function, provided by the package Async, along with the function sleep, provided by the package PromiseTimer. This way we simulate an asynchronous operation, such as obtaining external HTTP resources or executing database queries.
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Even though this Generator's side is quite obscure for most PHP developers, it has been extensively explored by well-known libraries, such as ReactPHP and AMPHP, which we will see later on.
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promises-spec
An open standard for sound, interoperable JavaScript promises—by implementers, for implementers.
The method getAsync, as well as their similar postAsync, putAsync, deleteAsync and so on, return a Promise, which implements the Promises/A+ spec. You can chain their calls or wait for all of them concurrently, as we've done. Executing this script would result in something like:
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