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The containing class is available as IO\ReadHandle in the www repository.

Read a fixed amount of data

public function readFixedSizeAsync(
  int $size,
  ?int $timeout_ns = NULL,
): Awaitable<string>;

Will fail with EPIPE if the file is closed before that much data is available.

It is possible for this to never return, e.g. if called on a pipe or or socket which the other end keeps open forever. Set a timeout if you do not want this to happen.


  • int $size
  • ?int $timeout_ns = NULL