(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_read — Reads bytes from a file descriptor
dio_read ( resource $fd [, int $len = 1024 ] ) : string
The function dio_read() reads and returns len bytes from file with descriptor fd.
fd
The file descriptor returned by dio_open().
len
The number of bytes to read. If not specified, dio_read() reads 1K sized block.
The bytes read from fd.
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https://www.php.net/manual/en/function.dio-read.php