How can PHP beginners improve their understanding of file handling functions to avoid errors like double counting numbers from text files?

When handling text files in PHP, beginners should pay close attention to how they read and process the file data to avoid errors like double counting numbers. One way to prevent this issue is to properly initialize variables before processing file data and ensure that the counting logic is correctly implemented. Additionally, using functions like `feof()` and `fgets()` can help in reading file data line by line and avoiding redundant counting.

$file = fopen("numbers.txt", "r");
$count = 0;

while(!feof($file)){
    $line = fgets($file);
    $numbers = explode(",", $line);
    
    foreach($numbers as $number){
        $count += intval($number);
    }
}

fclose($file);

echo "Total sum of numbers: " . $count;