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

Open a file for reading or writing

Attempt to open a file or 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

Upon success it returns a file handle which may be used together with the other file functions that require a handle such as fgets(), fwrite(), fclose() and feof()

If the attempt to open the file or stream fails it will return 0

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

f485open() - Open the RS-485 port as a stream

fseropen() - Open the serial port as a stream

fsockopen() - Open an internet socket connection

fclose() - Close a file, stream or socket

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

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

fread() - Return bytes from a file or stream

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

ftell() - Return current file position in an open file

fwrite() - Write data to a file or stream

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

chdir() - Change uPHP's current directory

if - Flow control structure for conditional execution