Bob Weinand bwoebi

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              Last active
              February 19, 2022 01:08
            
              
                fread() on non-blocking sockets
              
          
        
      
        
  
      
    Reading of non-blocking TCP sockets in PHP

As a short heads-up for those unfamiliar:

There is a PHP level buffer. Whenever more is actually read from the socket (default chunk size is 8192), than the user requests in his PHP code, the data is stored there.
There is an OS level buffer. There all incoming network data lands. The event loop only knows of that one and checks that one for being non-empty.

Trivial single read

The trivial reading function in PHP is fread($socket, $maxSize).