PHP 5 >= 5.3.3, PHP 7, PHP 8
stream_set_read_buffer - Set read file buffering on the given stream
stream_set_read_buffer( resource$stream, int$size ): int
Sets the read buffer. It's the equivalent of stream_set_write_buffer, but for read operations.
The file pointer.
The number of bytes to buffer. If size is 0 then read operations are unbuffered. This ensures that all reads with fread are completed before other processes are allowed to read from that input stream.
Returns 0 on success, or another value if the request cannot be honored.