WMPRO, WMMINI FW >= 1.0 WMMEGA FW >= 2.0

Open a file for reading or writing

Attempt to open a file (or special stream) for reading or writing, and return the file handle for future operations

$filename: If a path is omitted, the current directory will be used to search for the file. Relative paths are supported. Two special file names will open specific streams instead:

• 'php://stdin' - This will open a stream that will accept characters from a telnet console, allowing for interactive applications responding to keystrokes, when using mode 'r'
• 'php://stdout' - This will send output characters to the standard output device, such as a telnet console, when using mode 'w'

$mode: The following strings are supported:

• 'r' - Open the file (or stream) in read-only mode
• 'w' - Open the file (or stream) in write mode, which will overwrite the file
• 'a' - Open the file in append mode for writing, which will open the file and move the pointer to the end of the file

Integer: File handle, or 0 if the attempt to open the file or stream fails

The file handle may be used together with the other file functions that require a handle such as fgets(), fwrite(), fclose() and feof()

<?
  $f=fopen("/index.cgi","r");
  if ($f) {
    print("File opened successfully");
    fclose($f);
  } else {
    print("File open failed");
  }
?>

fseropen() - Open the serial port at the specified baud rate with optional parameters

f485open() - Open the RS-485 port at the specified baud rate and parity

fsockopen() - Open an internet socket connection with optional timeout

fread() - Read bytes from a file, stream or socket

fgets() - Return a single line from a file, stream or socket, with optional size limit

fwrite() - Write data to a file, stream or socket

tar_put() - Add a file to an open file in TAR format

feof() - Test if no more data is available in a file, stream or socket

filesize() - Return the size of a file, or the number of unread bytes in a stream or socket

fseek() - Position the file pointer in an open file

ftell() - Return the current position of a file read/write pointer

fclose() - Close a file, stream or socket