Having troubles understand Modulus
Question posted by: nomad
( Expert)
on
August 27th, 2008 06:50 PM
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
-
$days = Array("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
-
echo "<TABLE BORDER=1 CELLPADDING=5><tr>\n";
-
foreach ($days as $day) {
-
echo "<TD BGCOLOR=\"#CCCCCC\" ALIGN=CENTER><strong>$day</strong></td>\n";
-
}
-
for ($count=0; $count < (6*7); $count++) {
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$dayArray = getdate($start);
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if (($count % 7) == 0) {
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if ($dayArray['mon'] != $month) {
-
break;
-
} else {
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echo "</tr><tr>\n";
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}
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}
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if ($count < $firstDayArray['wday'] || $dayArray['mon'] != $month) {
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echo "<td> </td>\n";
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} else {
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echo "<td>".$dayArray['mday']." </td>\n";
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$start += ADAY;
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}
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}
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echo "</tr></table>";
-
?>
The part I'm trying to understand is
- if (($count % 7) == 0) {
-
if ($dayArray['mon'] != $month) {
-
break;
-
} else {
-
echo "</tr><tr>\n";
-
}
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.
4
Answers Posted
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.
Quote:
Originally Posted by markusn00b
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 $count is the variable coming from the user from the pull down menu?
sorry new to this info.
nomad
Quote:
Originally Posted by nomad
I get that part but still trying to figure out where the number is coming from
for ($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.
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:
-
$count = 0;
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while ($count < 42)
-
{
-
// Do the loop code here
-
-
$count ++;
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}
The for loop syntax is just a shortcut, to make the code cleaner and easier to read.
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