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

An immediate, unordered read

public function readImpl(
  ?int $max_bytes = NULL,
): string;


  • ?int $max_bytes = NULL the maximum number of bytes to read
  • if null, an internal default will be used.
  • if 0, EINVAL will be raised.
  • up to $max_bytes may be allocated in a buffer; large values may lead to unnecessarily hitting the request memory limit.


  • string