Why is the decimal not being displayed after formatting a PHP variable?

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There could be several reasons why the decimal is not being displayed after formatting a PHP variable:

1. The number being formatted may be an integer rather than a floating-point number. To display decimals, the number must be a floating-point number.

2. The formatting function used may not have included the decimal point in the format string. The format string should include a decimal point to display decimals.

3. The number being formatted may have too many decimal places, causing the decimal to be rounded or truncated. Increasing the number of decimal places in the format string can display more decimal places.

4. The PHP configuration settings may be set to display integers rather than floating-point numbers. In this case, changing the configuration settings can enable the display of decimals.