[PHP] Variable Syntax Question

[Ninety-Nine Ways To Die]

I have a form that reads in a couple variables via:

<input type=textbox name=bob1>
<input type=textbox name=bob2>
<input type=textbox name=bob3>
<input type=textbox name=bob4>

Now... I want to read in those variables in something like the following:

for($i=1;$i<4;$i++) {
   echo "$bob$i";
}

BUT.... that obviously doesn't work, it simple prints 1, so how to I make it echo the 
value of the variable bob1?

-Hass


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