For loops

[Tarsonis21]

If there is two for loops, one being placed inside another, how will it execute.

Example:

 for(forloop1; forloop1; forloop1++){


   for(forloop2; forloop2; forloop2++){

}

}

Would it execute forloop2 to its end then loop back to forloop1 + 1 then do forloop2 to its end?

I'm trying to do an x,y mapping system dynamically created from a database. I need it to start at the smallest y then do every x value on that y axis, proceeding to next y value and doing every x value for that y vertices value.

Example:

Range is -10,-10 to 10,10.

I need to come up with an algorythm that will do all variables in that range.

ie. -10,-10 .. -10,-9 .. -10,-8 ... etc.. -10,10
-9,-10 .. -9, -9 ... etc.. -9, 10

So on and so forth.. I'm having problems trying to come up with this. Any ideas?

[sneakyimp]

with two for loops

for($y=0; $y<100; $y++) {
   for($x=0; $x<100; $x++) {
         echo "($x, $y),";
   }
   echo "<BR>";
}

the outer loop will start: y=0;
then it will go through all x's 0 thru 99;
then y=1;
all x's 0 thru 99
then y=2
all x's 0 thru 99, etc.

try the code above and see.