What is the common mistake made when using the unlink function in PHP?

The common mistake made when using the unlink function in PHP is not checking if the file exists before attempting to delete it. This can result in an error being thrown if the file does not exist, causing the script to stop executing. To solve this issue, you should first check if the file exists using the file_exists function before calling unlink.

$file_path = 'path/to/file.txt';

if(file_exists($file_path)){
    unlink($file_path);
    echo "File deleted successfully.";
} else {
    echo "File does not exist.";
}