Explain this logic to me...

[Anon]

This code works just fine, but I don't understand how it works. It's to make every other table row on my search results page alternate colors. I guess I don't understand how $color is assigned 0 or 1.

$result = mysql_query($sql,$connection) or die("Couldn't execute query.");

$cellcolor = array('blue','red');
$color = 0;

while ($row = mysql_fetch_array($result)) {

$id = $row['id'];
$location = $row['location'];

if ("0"==$color){$color="1";}
else {$color="0";}

$display_block .= "
<TR BGCOLOR=$cellcolor[$color]><TD>

[btanner]

Its right here....

if ("0"==$color){
$color="1"0;
}
else {
$color="0";
}

Every loop through, $color is checked....

if $color=0, then set it to 1
else (ie $color!=0 ie $color=1) set it to 0

Because you are in a loop, you are effectively seeing $color from the last loop iteration -- whatever it was, make it the opposite.

Is that clear?

[brandonschnell]

$color might start out as 0 or 1 or something else when the variable is created but really we don't care. on the first run through if $color is somehow set to 0 its changed to 1, otherwise regardless of how $color started out its changed to 0. so now we've got $color set as 1 or 0. then loop through the code as the previous post described changing $color to 0 and 1 and back again.