How is the file being opened and what is the unexpected result?

The file is being opened using the `fopen()` function in PHP, but the mode used for opening the file is incorrect. The unexpected result could be that the file is not being opened or accessed properly due to the incorrect mode specified in the `fopen()` function. To solve this issue, ensure that the correct mode is specified when opening the file using `fopen()`. For example, if you want to open the file for reading, use the mode `'r'`.

$file = fopen("example.txt", "r") or die("Unable to open file!");