PHP show only significant (non-zero) decimals

Question

In PHP (using built-in functions) I\'d like to convert/format a number with decimal, so that only the non-zero decimals show. However, another requirement of mine is that if

Answer 1

A trailing zero is significant:

• A value of 9.0 implies, that the real value is more than 8.9 and less than 9.1
• A value of 9.00000 implies, that the real value is more than 8.99999 and less than 9.00001

Therefore, your requirement is quite unusual. That's the reason why no function exists to do what you want.