Smarty

[Laangelinaj]

Hi, I'm a newbie in smarty
And i got problem with my smarty

I want to make a condition to get 1 phone number from the user either phone or phone2. And also i want to check whether it's 10 digits for every phone number. Then I want to add 0 in front of the phone number when the phone number just 9 digits.
My code below:

{if !isset($PHONE) && $PHONE2|substr:0:10==''}'0{$PHONE2}{else if !isset($PHONE)}'{$PHONE2}{else if isset($PHONE) && $PHONE != ''&& $PHONE|substr:0:10==''}'0{$PHONE}{else}'{$PHONE}{/if}

By the way, I'll put the code on CSV
Really thanks for the help before