How can using the wrong parameter with filesize() lead to errors in file handling and processing?

Using the wrong parameter with filesize() can lead to errors in file handling and processing because the function expects a string parameter that represents the path to the file. If an incorrect parameter is passed, the function may not be able to locate the file, resulting in errors or unexpected behavior. To solve this issue, always ensure that the correct file path is provided as the parameter to filesize().

$file_path = 'path/to/your/file.txt';
$file_size = filesize($file_path);
if ($file_size !== false) {
    echo "The size of the file is: " . $file_size . " bytes";
} else {
    echo "Error: Unable to get the file size.";
}