Tạo mạng xã hội với PHP - part 29 potx

Events and Birthdays
[ 262 ]
// increment and loop
$start++;
$days++;
}

// done
$this->dates = $cal_dates;
$this->dateStyles = $cal_dates_style;
$this->dateData = $cal_dates_data;
}
Days in the month
Calculating the days in a month is a fairly simple task; all months have a set number
of days in them, except for February, so for February, we simply need to check
whether the current year is a leap year:
/**
* How many days are in a month?
* @param int $m month
* @param int $y year
* @return int the number of days in the month
*/
function daysInMonth($m, $y)
{
If we have been passed a month that isn't valid, simply return zero:
if( $m < 1 || $m > 12 )
{
return 0;
}
else
{

September, April, June, and November have 30 days—so for these months,
return 30:
// 30: 9, 4, 6, 11
if( $m == 9 || $m == 4 || $m == 6 || $m == 11 )
{
return 30;
}
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
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Chapter 9
[ 263 ]
For any remaining month that isn't February (all the rest have 31), we return 31:
else if( $m != 2 )
{
// all the rest have 31
return 31;
}
else
{
A year isn't a leap year if the year isn't divisible by 4, so in this instance,
we return 28:
// except for february alone
if( $y % 4 != 0 )
{
// which has 28
return 28;
}
else
{

If a year isn't divisible by 100, then it is a leap year, so we return 29:
if( $y % 100 != 0 )
{
// and on leap years 29
return 29;
}
else
{
If the year isn't divisible by 400, then it isn't a leap year, so we return 28:
if( $y % 400 != 0 )
{
// deja vu: which has 28
return 28;
}
else
{
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
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Events and Birthdays
[ 264 ]
If it is divisible by 400, then we return 29, as it is a leap year:
// deja vu: and on leap years 29
return 29;
}
}
}
}
}
}

And there we have a very handy function, as part of our calendar library, to
determine the number of days in any given month.
Ordered days
As discussed earlier, our calendar is set to be customizable in terms of which day of
the month is the start date. Because of this, our array of days (private $days = ar
ray('Sun','Mon','Tue','Wed','Thu','Fri', 'Sat');)
needs to be re-ordered
based on the chosen rst day of the week:
/**
* Get days in order
* @return array array of days (as strings)
*/
function getDaysInOrder()
{
$ordered_days = array();
for( $i = 0; $i < 7; $i++ )
{
$ordered_days[] = $this->days[ ( $this->startDay + $i ) % 7
];
}
return $ordered_days;
}
Previous month
Most calendars display links to the next and previous month, making it easy for the
user to navigate between months. For this to be done, we need to know the month
and if appropriate, year, of the next month and previous month.
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
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Chapter 9

[ 265 ]
We can easily get this information in integer form, by incrementing or decrementing
the current month, unless we are at an edge case, such as month 1, where we go to
12, and then decrease the year. To make this as exible as possible, we can simply
create a new calendar object, representing the previous month, and whichever
controller requires it can simply look up the month, month name, and year from
the object and display that to the user:
/**
* Get previous month
* @return Object calendar object
*/
public function getPreviousMonth()
{
$pm = new Calendar( '', ( ( $this->month > 1 ) ?
$this->month - 1 : 12 ), ( ( $this->month == 1 ) ?
$this->year-1 : $this->year ) );
return $pm;
}
Next month
As with the previous month, a method to return a calendar object for the next month:
/**
* Get next month
* @return Object calendar object
*/
public function getNextMonth()
{
$nm = new Calendar( '', ( ($this->month < 12 ) ?
$this->month + 1 : 1), ( ( $this->month == 12 ) ?
$this->year + 1 : $this->year ) );
return $nm;

}
Displaying a calendar
With our calendar library in place, we now need to look at how a controller would
leverage the power of the library to generate a particular month, and display it to
the user.
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
Download from www.eBookTM.com
Events and Birthdays
[ 266 ]
Generate and output
To actually display a calendar, we need some code which:
• Requires the calendar library
• Instantiates the object
• Generates the month
• Sends various bits of data to the template
• Outputs the template
We also need a template le with our 42 boxes in a calendar grid.
The following code can be used to generate a calendar (this isn't for a specic feature,
you can nd the code in the
testOutput() method in the calendar controller):
// require the class
require_once( FRAMEWORK_PATH . 'lib/calendar/calendar.class.php'
);
// set the default month and year, i.e. the current month and
year
$m = date('m');
$y = date('Y');
// check for a different Month / Year (i.e. user has moved to
another month)

if( isset( $_GET['month'] ) )
{
$m = intval( $_GET['month']);
if( $m > 0 && $m < 13 )
{

}
else
{
$m = date('m');
}
}
if( isset( $_GET['year'] ) )
{
$y = intval( $_GET['year']);
}
// Instantiate the calendar object
$calendar = new Calendar( '', $m, $y );
// Get next and previous month / year
$nm = $calendar->getNextMonth()->getMonth();
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
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Chapter 9
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$ny = $calendar->getNextMonth()->getYear();
$pm = $calendar->getPreviousMonth()->getMonth();
$py = $calendar->getPreviousMonth()->getYear();

// send next / previous month data to the template

$this->registry->getObject('template')->getPage()-
>addTag('nm', $nm );
$this->registry->getObject('template')->getPage()-
>addTag('pm', $pm );
$this->registry->getObject('template')->getPage()-
>addTag('ny', $ny );
$this->registry->getObject('template')->getPage()-
>addTag('py', $py );
// send the current month name and year to the template
$this->registry->getObject('template')->getPage()-
>addTag('month_name', $calendar->getMonthName() );
$this->registry->getObject('template')->getPage()-
>addTag('the_year', $calendar->getYear() );
// Set the start day of the week
$calendar->setStartDay(0);
// Get how many days there are in the month


// build the month, generate some data
$calendar->buildMonth();
// days
$this->registry->getObject('template')->dataToTags( $calendar-
>getDaysInOrder(),'cal_0_day_' );
// dates
$this->registry->getObject('template')->dataToTags( $calendar-
>getDates(),'cal_0_dates_' );
// styles
$this->registry->getObject('template')->dataToTags( $calendar-
>getDateStyles(),'cal_0_dates_style_' );
// data

$this->registry->getObject('template')->dataToTags( $calendar-
>getDateData(),'cal_0_dates_data_' );

$this->registry->getObject('template')->buildFromTemplates(
'test-calendar.tpl.php' );
In terms of the template, we need a grid of 42 potential calendar dates, each with a
template tag for a class, and a template tag for the date, and a template tag for any
potential data within.
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
Download from www.eBookTM.com
Events and Birthdays
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The days of the week are also template tags, as we may wish to dynamically generate
them based off an individual user's preference, as highlighted below:
<html>
<body>

<h1> {month_name} {the_year} </h1>
<p><a href="calendar/?&amp;month={nm}&amp;year={ny}">Next</a>
<a href="calendar/?&amp;month={pm}&amp;year={py}">Previous</a></p>

<div>
<table id="ccc">
<tr>
<th class="weekend">{cal_0_day_0}</th>
<th class="">{cal_0_day_1}</th>
<th class="">{cal_0_day_2}</th>
<th class="">{cal_0_day_3}</th>
<th class="">{cal_0_day_4}</th>

<th class="">{cal_0_day_5}</th>
<th class="weekend">{cal_0_day_6}</th>
</tr>
<tr>
If we take a look at how an individual week (highlighted below) needs to be
represented, you can see that we prex the template tag with cal_0_ (more on
that later), and that they range from 0 to 41 (42 boxes):
<td class="weekend {cal_0_dates_style_0}">
{cal_0_dates_0} {cal_0_dates_data_0}</td>
<td class="{cal_0_dates_style_1}">{cal_0_dates_1}
{cal_0_dates_data_1}</td>
<td class="{cal_0_dates_style_2}">{cal_0_dates_2}
{cal_0_dates_data_2}</td>
<td class="{cal_0_dates_style_3}">{cal_0_dates_3}
{cal_0_dates_data_3}</td>
<td class="{cal_0_dates_style_4}">{cal_0_dates_4}
{cal_0_dates_data_4}</td>
<td class="{cal_0_dates_style_5}">{cal_0_dates_5}
{cal_0_dates_data_5}</td>
<td class="weekend {cal_0_dates_style_6}">{cal_0_dates_6}
{cal_0_dates_data_6}</td>
</tr>
<tr>
<td class="weekend {cal_0_dates_style_7}">{cal_0_dates_7}
{cal_0_dates_data_7}</td>
<td class="{cal_0_dates_style_8}">{cal_0_dates_8}
{cal_0_dates_data_8}</td>
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
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Chapter 9
[ 269 ]
<td class="{cal_0_dates_style_9}">{cal_0_dates_9}
{cal_0_dates_data_9}</td>
<td class="{cal_0_dates_style_10}">{cal_0_dates_10}
{cal_0_dates_data_10}</td>
<td class="{cal_0_dates_style_11}">{cal_0_dates_11}
{cal_0_dates_data_11}</td>
<td class="{cal_0_dates_style_12}">{cal_0_dates_12}
{cal_0_dates_data_12}</td>
<td class="weekend {cal_0_dates_style_13}">
{cal_0_dates_13} {cal_0_dates_data_13}</td>
</tr>
<tr>
<td class="weekend {cal_0_dates_style_14}">
{cal_0_dates_14} {cal_0_dates_data_14}</td>
<td class="{cal_0_dates_style_15}">{cal_0_dates_15}
{cal_0_dates_data_15}</td>
<td class="{cal_0_dates_style_16}">{cal_0_dates_16}
{cal_0_dates_data_16}</td>
<td class="{cal_0_dates_style_17}">{cal_0_dates_17}
{cal_0_dates_data_17}</td>
<td class="{cal_0_dates_style_18}">{cal_0_dates_18}
{cal_0_dates_data_18}</td>
<td class="{cal_0_dates_style_18}">{cal_0_dates_19}
{cal_0_dates_data_19}</td>
<td class="weekend {cal_0_dates_style_20}">
{cal_0_dates_20} {cal_0_dates_data_20}</td>
</tr>
<tr>

<td class="weekend {cal_0_dates_style_21}">
{cal_0_dates_21} {cal_0_dates_data_21}</td>
<td class="{cal_0_dates_style_22}">{cal_0_dates_22}
{cal_0_dates_data_22}</td>
<td class="{cal_0_dates_style_23}">{cal_0_dates_23}
{cal_0_dates_data_23}</td>
<td class="{cal_0_dates_style_24}">{cal_0_dates_24}
{cal_0_dates_data_24}</td>
<td class="{cal_0_dates_style_25}">{cal_0_dates_25}
{cal_0_dates_data_25}</td>
<td class="{cal_0_dates_style_26}">{cal_0_dates_26}
{cal_0_dates_data_26}</td>
<td class="weekend {cal_0_dates_style_27}">
{cal_0_dates_27} {cal_0_dates_data_27}</td>
</tr>
<tr>
<td class="weekend {cal_0_dates_style_28}">
{cal_0_dates_28} {cal_0_dates_data_28}</td>
<td class="{cal_0_dates_style_29}">{cal_0_dates_29}
{cal_0_dates_data_29}</td>
<td class="{cal_0_dates_style_30}">{cal_0_dates_30}
{cal_0_dates_data_30}</td>
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
Download from www.eBookTM.com
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<td class="{cal_0_dates_style_31}">{cal_0_dates_31}
{cal_0_dates_data_31}</td>
<td class="{cal_0_dates_style_32}">{cal_0_dates_32}

{cal_0_dates_data_32}</td>
<td class="{cal_0_dates_style_33}">{cal_0_dates_33}
{cal_0_dates_data_33}</td>
<td class="weekend {cal_0_dates_style_34}">
{cal_0_dates_34} {cal_0_dates_data_34}</td>
</tr>
<tr>
<td class="weekend {cal_0_dates_style_35}">
{cal_0_dates_35} {cal_0_dates_data_35}</td>
<td class="{cal_0_dates_style_36}">{cal_0_dates_36}
{cal_0_dates_data_36}</td>
<td class="{cal_0_dates_style_37}">{cal_0_dates_37}
{cal_0_dates_data_37}</td>
<td class="{cal_0_dates_style_38}">{cal_0_dates_38}
{cal_0_dates_data_38}</td>
<td class="{cal_0_dates_style_39}">{cal_0_dates_39}
{cal_0_dates_data_39}</td>
<td class="{cal_0_dates_style_40}">{cal_0_dates_40}
{cal_0_dates_data_40}</td>
<td class="weekend {cal_0_dates_style_41}">
{cal_0_dates_41} {cal_0_dates_data_41}</td>
</tr>

</table>

</body>
</html>
If we now go to /calendar/test/, we should see the following:
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246

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Chapter 9
[ 271 ]
Multiple calendars
As our calendar returns information as arrays, we simply send it to the template
manager using the dataToTags method, with a prex of our choice. If we have
multiple instances of a calendar object, we can send them to different parts of a
template by changing the prex. For example, if we have a template with a large
calendar display for the current month (prexed with cal_0_), a small calendar for
the previous month (prexed with cal_1_) and a small calendar for the next month
(prexed with cal_2_), we can put the three on the calendar with code such as
the following:
$calendar = new Calendar( '', $m, $y );
// build the month, generate some data
$calendar->buildMonth();
// days
$this->registry->getObject('template')->dataToTags( $calendar-
>getDaysInOrder(),'cal_0_day_' );
// dates
$this->registry->getObject('template')->dataToTags( $calendar-
>getDates(),'cal_0_dates_' );
// styles
$this->registry->getObject('template')->dataToTags( $calendar-
>getDateStyles(),'cal_0_dates_style_' );
// data
$this->registry->getObject('template')->dataToTags( $calendar-
>getDateData(),'cal_0_dates_data_' );

$calendarPrevious = $calendar->getPreviousMonth();
// build the month, generate some data

$calendarPrevious->buildMonth();
// days
$this->registry->getObject('template')->dataToTags(
$calendarPrevious->getDaysInOrder(),'cal_1_day_' );
// dates
$this->registry->getObject('template')->dataToTags(
$calendarPrevious->getDates(),'cal_1_dates_' );
// styles
$this->registry->getObject('template')->dataToTags(
$calendarPrevious->getDateStyles(),'cal_1_dates_style_' );
// data
$this->registry->getObject('template')->dataToTags(
$calendarPreviousndar->getDateData(),'cal_1_dates_data_' );

$calendarNext = $calendar->getNextMonth();
// build the month, generate some data
This material is copyright and is licensed for the sole use by RAYMOND ERAZO on 25th October 2010
3146 KERNAN LAKE CIRCLE, JACKSONVILLE, 32246
Download from www.eBookTM.com