eio_read

eio_read

Read from a file descriptor at given offset

resource **eio_read** mixed $fd int $length int $offset int $pri callable $callback mixed $data

reads up to 

bytes from file descriptor at . The read bytes are stored in argument of . eio_read``length``fd``offset``result``callback

fdStream, Socket resource, or numeric file descriptor

lengthMaximum number of bytes to read.

offsetOffset within the file.

pri``callback``data Arbitrary variable passed to . callback

stores read bytes in argument of function. eio_read``result``callback

Voorbeeld: example

<?php
// Open a temporary file and write some bytes there
$temp_filename = "eio-temp-file.tmp";
$fp = fopen($temp_filename, "w");
fwrite($fp, "1234567890");
fclose($fp);

/* Is called when eio_read() is done */
function my_read_cb($data, $result) {
    global $temp_filename;

 // Output read bytes
    var_dump($result);

 // Close file
    eio_close($data);
    eio_event_loop();

 // Remove temporary file
    @unlink($temp_filename);
}

/* Is called when eio_open() is done */
function my_file_opened_callback($data, $result) {
 // $result should contain the file descriptor
    if ($result > 0) {
  // Read 5 bytes starting from third
        eio_read($result, 5, 2, EIO_PRI_DEFAULT, "my_read_cb", $result);
        eio_event_loop();
    } else {
  // eio_open() failed
        unlink($data);
    }
}

// Open the file for reading and writing
eio_open($temp_filename, EIO_O_RDWR, NULL,
    EIO_PRI_DEFAULT, "my_file_opened_callback", $temp_filename);
eio_event_loop();
?>

string(5) "34567"

eio_open``eio_write``eio_close``eio_event_loop