What are some common mistakes that PHP beginners make when working with number formatting functions?

One common mistake that PHP beginners make when working with number formatting functions is not specifying the correct number of decimal places. This can lead to numbers being displayed incorrectly or with unnecessary precision. To solve this issue, make sure to specify the desired number of decimal places when using number formatting functions like number_format().

// Incorrect usage without specifying decimal places
$number = 1234.5678;
$formatted_number = number_format($number); // Incorrect output: 1,235

// Corrected usage with specifying decimal places
$formatted_number = number_format($number, 2); // Correct output: 1,234.57
echo $formatted_number;