calculate xml size

[email protected] ("Vo, Lance")
Newsgroups php.soap
Message-ID <[email protected]> 
hi 
does php has any function that calculate a xml element in bytes or anything:
example:
 
<tests>
<test1>ABC</test1>
<test2>DEF</test2>
</tests>
 
If I want to calculate element <test1>, it should return 18 bytes.
Any suggestion is welcomed.
 
thanks
Lance
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