I was looking for a simple PHP generated calendar. But I wanted to place detailed information to show on demand. And installing another database with separate management would have been too much of access codes and passwords to remember. And what if I want someone else to manage the calendar when I am not able? This is my version of using simple PHP calendar script to link to Yahoo! calendar.
The twist is that figuring out how Yahoo! calendar selection worked. And then depending on which date was clicked it will bring up the appropriate date/week on Yahoo! calendar.
First step was to understand the url.
When checking the status bar I noticed //calendar.mail.yahoo.com/trap17.demo/?v=1&t=1157068800.
The values of v as follows:
v=0 : day view
v=1 : week view
v=2 : month view ...etc
The values of t as follows:
t values were assigned in total seconds in Unix Epoch time format starting from January 1, 1970. It took me about 8 hours to figure out how this worked. The logic I used was to figure out how to translate any given day number to unix seconds correctly. This will give an approximate time value for Yahoo! calendar to display correctly.
CODE
echo "<td bgcolor=#f2f2f2><a class='navigation' target='_blank' href='$yahoo/?v=0&t=$unixtime'> $day_num </a></td>\n";
This is the clickable link the script will generate using above values.
CODE
$clickdate = unixtojd(mktime(0,0,0,$month,$day_num,$year))
I found this code accidently that this will translate any $month, $day_num and $year set by the script. This was the hard part. Assign this to a variable.
CODE
$unixtime = jdtounix($clickdate);
Once a desired date's unix time was located, it must be re-translated back to Unix Epoch time format. Note that when you just use unixtojd, it will return time value that does not match to the right number of digits. It's because Unix Epoch counts seconds from january 1, 1970. So let's say you want to find Unix Epoch of September 1, 2006, you have to figure out the total second difference between these two dates
Too much of work. But when unix time was found for julian date, you can then turn unix time to Unix Epoch value.CODE
$yahoo = "http://calendar.mail.yahoo.com/trap17.demo";
To make my code user friendly, I have assigned the link to Yahoo! calendar as a variable.
And the complete code goes like this. I modified from the original to insert a color
CODE
<?php
//--my addition to Yahoo variables
$yahoo = "http://calendar.mail.yahoo.com/trap17.demo";
//This gets today's date
$date =time ();
//This puts the day, month, and year in seperate variables
$day = date('d', $date);
$month = date('m', $date);
$year = date('Y', $date);
//Here we generate the first day of the month
$first_day = mktime(0,0,0,$month, 1, $year);
//This gets us the month name
$title = date('F', $first_day);
//Here we find out what day of the week the first day of the month falls on
$day_of_week = date('D', $first_day);
//Once we know what day of the week it falls on, we know how many blank days occure before it.
//If the first day of the week is a Sunday then it would be zero
switch($day_of_week){
case "Sun": $blank = 0; break;
case "Mon": $blank = 1; break;
case "Tue": $blank = 2; break;
case "Wed": $blank = 3; break;
case "Thu": $blank = 4; break;
case "Fri": $blank = 5; break;
case "Sat": $blank = 6; break;
}
//We then determine how many days are in the current month
$days_in_month = cal_days_in_month(0, $month, $year);
//Here we start building the table heads
echo "<table border=1 width=250>";
echo "<tr><th colspan=7> $title $year </th></tr>";
echo "<tr>
<td width=35 align=center>S</td>
<td width=35 align=center>M</td>
<td width=35 align=center>T</td>
<td width=35 align=center>W</td>
<td width=35 align=center>T</td>
<td width=35 align=center>F</td>
<td width=35 align=center>S</td>
</tr>";
//This counts the days in the week, up to 7
$day_count = 1;
echo "<tr>";
//first we take care of those blank days
while ( $blank > 0 )
{
echo "<td></td>\n";
$blank = $blank-1;
$day_count++;
}
//sets the first day of the month to 1
$day_num = 1;
//count up the days, untill we've done all of them in the month
while ( $day_num <= $days_in_month )
{
//--my addition to Yahoo variables 2
$clickdate = unixtojd(mktime(0,0,0,$month,$day_num,$year));
$unixtime = jdtounix($clickdate);
echo "<td bgcolor=#f2f2f2><a class='navigation' target='_blank' href='$yahoo/?v=0&t=$unixtime'>
$day_num </a></td>\n";
$day_num++;
$day_count++;
//Make sure we start a new row every week
if ($day_count > 7)
{
echo "</tr><tr>\n";
$day_count = 1;
}
}
//Finaly we finish out the table with some blank details if needed
while ( $day_count >1 && $day_count <=7 )
{
echo "<td> </td>";
$day_count++;
}
echo "</tr></table>";
?>
//--my addition to Yahoo variables
$yahoo = "http://calendar.mail.yahoo.com/trap17.demo";
//This gets today's date
$date =time ();
//This puts the day, month, and year in seperate variables
$day = date('d', $date);
$month = date('m', $date);
$year = date('Y', $date);
//Here we generate the first day of the month
$first_day = mktime(0,0,0,$month, 1, $year);
//This gets us the month name
$title = date('F', $first_day);
//Here we find out what day of the week the first day of the month falls on
$day_of_week = date('D', $first_day);
//Once we know what day of the week it falls on, we know how many blank days occure before it.
//If the first day of the week is a Sunday then it would be zero
switch($day_of_week){
case "Sun": $blank = 0; break;
case "Mon": $blank = 1; break;
case "Tue": $blank = 2; break;
case "Wed": $blank = 3; break;
case "Thu": $blank = 4; break;
case "Fri": $blank = 5; break;
case "Sat": $blank = 6; break;
}
//We then determine how many days are in the current month
$days_in_month = cal_days_in_month(0, $month, $year);
//Here we start building the table heads
echo "<table border=1 width=250>";
echo "<tr><th colspan=7> $title $year </th></tr>";
echo "<tr>
<td width=35 align=center>S</td>
<td width=35 align=center>M</td>
<td width=35 align=center>T</td>
<td width=35 align=center>W</td>
<td width=35 align=center>T</td>
<td width=35 align=center>F</td>
<td width=35 align=center>S</td>
</tr>";
//This counts the days in the week, up to 7
$day_count = 1;
echo "<tr>";
//first we take care of those blank days
while ( $blank > 0 )
{
echo "<td></td>\n";
$blank = $blank-1;
$day_count++;
}
//sets the first day of the month to 1
$day_num = 1;
//count up the days, untill we've done all of them in the month
while ( $day_num <= $days_in_month )
{
//--my addition to Yahoo variables 2
$clickdate = unixtojd(mktime(0,0,0,$month,$day_num,$year));
$unixtime = jdtounix($clickdate);
echo "<td bgcolor=#f2f2f2><a class='navigation' target='_blank' href='$yahoo/?v=0&t=$unixtime'>
$day_num </a></td>\n";
$day_num++;
$day_count++;
//Make sure we start a new row every week
if ($day_count > 7)
{
echo "</tr><tr>\n";
$day_count = 1;
}
}
//Finaly we finish out the table with some blank details if needed
while ( $day_count >1 && $day_count <=7 )
{
echo "<td> </td>";
$day_count++;
}
echo "</tr></table>";
?>
Since this is a simple table generating sequence, it will obey all your CSS template
Which is a very good thing. You can insert HREF class for the link. See the working model here calendar
Next project modification idea - making hover effect to show different options, i.e. view in month/week/day. Give it a try...
**UPDATE**
Looks like instead of translating and re-translating you can simply use
CODE
$unixtime = mktime(0,0,0,$month,$day_num,$year);
now that I understand how mktime() works
