If statement question

[Alex Major <alex.major@xxxxxxxxxxxx>]

Hi list.
Basically, I'm still learning new things about php and I was wondering if
things inside an if statement get 'looked at' by a script if the condition
is false.
For example, would this mysql query get executed if $number = 0 ?

If ($number == 1) {
    mysql_query($blah)
}

I know that's not really valid php, but hope it gets my point across. I was
just wondering from an optimisation perspective, as I don't want sql
commands being executed when they don't need to be (unnecessary server
usage). 

Thanks in advance for your responses.
Alex.

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