For Loop for loop problem

[adly3000 0]

i'd like to make for loop which dependes on a $_GET variable:

here is my tries:

if (isset($_GET['date']){switch($_GET['date'])	{		case 'asc':$exp1 = "$x>0";$exp2 = "$x=$total";			$condition = '$x++';			break;		case 'desc';$exp1 = "$x=$total";$exp2 = "$x>0";			$condition = '$x--';			break;	}}

then

for($exp1; $exp2; $condition){//** do something **//}

that is what i want to do, sure this code is wrong so what is the valid code?!!

[Spectre 0]

Although I wouldn't recommend it, you could use something like:

eval($exp1.';');while( eval('return '.$exp2.';') ) {		 /* Do something */	eval($condition.';');}

This will, essentially, perform the same as a for() loop.
Edited February 23, 2006 by Spectre (see edit history)

[agentredeye 0]

can i ask something for for loop..

 

can you make me a program on how to make a program about PALINDROME

 

using for loop and array.......

 

 

thanks..

 

just pm the code plsss...

 

i need it badly....

[Tyssen 0]

i need it badly....

If you need it that badly, maybe you should pay someone to do it for you.

[no9t9 0]

trying to do what you want is not difficult but it is not a good way to code. It is better to use logic to get things done... also, Personally, I don't like switch statements, why not just keep it simple and use if statement for only 2 conditions.

one other thing, assuming what you did works... you would have for(x>0,x=total,x++) and for(x=total,x>0,x--) ... that first for loop doesn't work... I am assuming you wanted for(x=0, x<total,x++). This is what you should do.

if ($_GET['date'] == 'asc') { $i = 0; $j = $total }else if ($_GET['date'] == 'desc') {$i = -$total; $j = $0 }for ($x=$i;$x<$j;$x++) { do stuff }

If you are actually using the count down counter for something just switch the sign (from neg to pos).

i'd like to make for loop which dependes on a $_GET variable:
here is my tries:

if (isset($_GET['date']){switch($_GET['date'])	{		case 'asc':$exp1 = "$x>0";$exp2 = "$x=$total";			$condition = '$x++';			break;		case 'desc';$exp1 = "$x=$total";$exp2 = "$x>0";			$condition = '$x--';			break;	}}

then

for($exp1; $exp2; $condition){//** do something **//}

that is what i want to do, sure this code is wrong so what is the valid code?!!

[adly3000 0]

thanks no9t9;

if ($_GET['date'] == 'asc') { $i = 0; $j = $total }else if ($_GET['date'] == 'desc') {$i = -$total; $j = $0 }for ($x=$i;$x<$j;$x++) { do stuff }

this helps alot, that is the the same as:

$start = 0;$end = $total;$step = 1;if (isset($_GET{"date"}) && $_GET{"date"} == "desc") {   $start = $total;   $end = 0;   $step = -1;}for ($x = $start; $x <= $end; $x += $step) {// something}