Having troubles understand Modulus

[nomad]

If I understand this right modules is used to divide a number and if there is a remainder that remainder is used?

here is part of a code that I'm trying to understand which produce part of a Calendar

[PHP]<?php
$days = Array("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
echo "<TABLE BORDER=1 CELLPADDING=5><tr>\n";
foreach ($days as $day) {
echo "<TD BGCOLOR=\"#CCCCCC\" ALIGN=CENTER><strong>$day</strong></td>\n";
}
for ($count=0; $count < (6*7); $count++) {
$dayArray = getdate($start);
if (($count % 7) == 0) {
if ($dayArray['mon'] != $month) {
break;
} else {
echo "</tr><tr>\n";
}
}
if ($count < $firstDayArray['wday'] || $dayArray['mon'] != $month) {
echo "<td>&nbsp;</td>\n";
} else {
echo "<td>".$dayArray['mday']." &nbsp;&nbsp; </td>\n";
$start += ADAY;
}
}
echo "</tr></table>";
?>[/PHP]


The part I'm trying to understand is
[PHP]if (($count % 7) == 0) {
if ($dayArray['mon'] != $month) {
break;
} else {
echo "</tr><tr>\n";
}[/PHP]

I know its trying to produce rolls for the week, but i just don't get it. I have read how its works several times. Question what is $count % 7) == 0 being divide by were does the variable $count gets it value from?

thanks

nomad

PS if you need more code I can give it out.

[Markus]

It's saying (because '%' is used to find the remainder of a number') if the remainder of $count / 7 is 0 (ie, 7 goes into $count perfectly) then run the code.

Hope this helps.

[nomad]

It's saying (because '%' is used to find the remainder of a number') if the remainder of $count / 7 is 0 (ie, 7 goes into $count perfectly) then run the code.

Hope this helps.

I get that part but still trying to figure out where the number is coming from
for ($count=0; $count < (6*7); $count++) { // ie $count is the variable coming from the user from the pull down menu?

sorry new to this info.

nomad

[Markus]

I get that part but still trying to figure out where the number is coming from
for ($count=0; $count < (6*7); $count++) { // ie $count is the variable coming from the user from the pull down menu?

sorry new to this info.

nomad

No, count is 0 and then incremented in the for loop. Am I missing your problem? Haha.

[Atli]

Hi.

Check out for loops in the manual.

The $count variable, in your case, is created inside the for loop to keep track of the number of loops that have been executed.

You could re-write that for loop like so, as a while loop:

$count = 0;
while ($count < 42) 
{
  // Do the loop code here
 
  $count ++;
}
 

The for loop syntax is just a shortcut, to make the code cleaner and easier to read.