I am used to use format 1, but I found a php standard document said that my code is not standard . but not tell why format 2 is better than format 1. any one tell me why?

I am used to use format 1, but I found a php standard document
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Bro, to be honest its entirely up to you. The pear framework uses it the second way. The majority of the others use the first.
PEAR http://pear.php.net/manual/en/standards.funcdef.php