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Event Calendar

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Содержание
  1. #How to build a web calendar in PHP
  2. #Building the Calendar class
  3. #Make it prettier
  4. #Source code
  5. Event Calendar with PHP
  6. Why should I use the calendar class?
  7. Source
  8. How To Use
  9. Example Code
  10. Conclusion

#How to build a web calendar in PHP

Calendar is a very common element in today’s web applications. Whether you are building an event booking application, appointment system or even a social network. Calendar is essential.

In this tutorial, we go through steps of building a calendar in PHP. After this tutorial, hopefully you will understand the concepts of building calendar and use the PHP calendar script in your own application.

#Building the Calendar class

Firstly copy the source code below to a class file «calendar.php». We will go through each important function. This «Calendar» class is a complete object, which will echo a HTML calendar upon calling its «show()» function. Cross month navigation is also handled. This makes it super handy to use.

Let us take a look at each function in detail.

  1. **public function show():**This is the only public function Calendar has. This function basically calls each private function below to create the HTML calendar interface. The basic idea of creating a web calendar is that, firstly it determines how many rows(weeks) to create, and then it loops over the rows and create 7 cells on each row. Meanwhile it puts corresponding day value to the cell according to the day of week (Monday to Sunday). Take a closer look at each private function below to understand.
  2. **private function _showDay():**This function will determine what value to put to the created cell. It can be empty or numbers.
  3. private function _createNavi(): This function will create the «Prev» && «Next» navigation buttons on the top of the calendar.
  4. private function _createLabels(): This function will create labels for the day of week. ( Monday to Sunday). You can update the language string to your own choice. But be cautious. You should not change the order of the labels.
  5. private function _weeksInMonth(): This is a tricky function. It can tell you how many weeks are there for a given month. This is used in show() function to create number of rows(weeks).
  6. private function _daysInMonth(); This function tells how many days in a given month.

Functions are working closely to create the PHP calendar. You should follow function show() to understand deeply how exactly they call each. Code is documented. Give yourself some time to read it.

#Make it prettier

Now the Calendar class is actually ready. However it looks messy without some CSS tricks. Let us create a CSS file «calendar.css» to make the calendar look pretty.

/*******************************Calendar Top Navigation*********************************/ div#calendar margin:0px auto; padding:0px; width: 602px; font-family:Helvetica, "Times New Roman", Times, serif; > div#calendar div.box position:relative; top:0px; left:0px; width:100%; height:40px; background-color: #787878 ;  > div#calendar div.header line-height:40px;  vertical-align:middle; position:absolute; left:11px; top:0px; width:582px; height:40px;  text-align:center; > div#calendar div.header a.prev,div#calendar div.header a.next  position:absolute; top:0px;  height: 17px; display:block; cursor:pointer; text-decoration:none; color:#FFF; > div#calendar div.header span.title color:#FFF; font-size:18px; > div#calendar div.header a.prev left:0px; > div#calendar div.header a.next right:0px; > /*******************************Calendar Content Cells*********************************/ div#calendar div.box-content border:1px solid #787878 ; border-top:none; > div#calendar ul.label float:left; margin: 0px; padding: 0px; margin-top:5px; margin-left: 5px; > div#calendar ul.label li margin:0px; padding:0px; margin-right:5px;  float:left; list-style-type:none; width:80px; height:40px; line-height:40px; vertical-align:middle; text-align:center; color:#000; font-size: 15px; background-color: transparent; > div#calendar ul.dates float:left; margin: 0px; padding: 0px; margin-left: 5px; margin-bottom: 5px; > /** overall width = width+padding-right**/ div#calendar ul.dates li margin:0px; padding:0px; margin-right:5px; margin-top: 5px; line-height:80px; vertical-align:middle; float:left; list-style-type:none; width:80px; height:80px; font-size:25px; background-color: #DDD; color:#000; text-align:center;  > :focus outline:none; > div.clear clear:both; >

Now let us show the calendar. Create a test file «index.php». And include «calendar.php» and «calendar.css» as below. At the body of the HTML, let us initialize a Calendar instance and call its show() function.

html> head>  link href="calendar.css" type="text/css" rel="stylesheet" /> head> body> php include 'calendar.php'; $calendar = new Calendar(); echo $calendar->show(); ?> body> html>

Now you should be able to see a nice working PHP calendar as follow:

PHP Calendar script

#Source code

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Event Calendar with PHP

Event Calendar with PHP

In this article, I have developed an event calendar class that will populate all the days in a month based on the specified date, along with the events that we can add to the calendar.

While PHP doesn’t include a built-in calendar API per se (without including additional extensions), it does, however, give you a broad range of date and time methods that we can use to manipulate. In addition, we can use these methods to populate the pages showing the days, weeks, and months of a particular year.

Why should I use the calendar class?

It’s entirely up to you and your requirements. I have decided to take it upon myself to write my own class as I work on many projects that require an event-based calendar system. I’ve searched countless times for a minimal, dependency-free, and modern library. But couldn’t find one that I could seamlessly integrate with my projects. Therefore, I created a PHP class that can easily be integrated with any project, whether the project’s size is small or large.

Source

Create a new file Calendar.php and add the following code:

active_year = $date != null ? date('Y', strtotime($date)) : date('Y'); $this->active_month = $date != null ? date('m', strtotime($date)) : date('m'); $this->active_day = $date != null ? date('d', strtotime($date)) : date('d'); > public function add_event($txt, $date, $days = 1, $color = '') < $color = $color ? ' ' . $color : $color; $this->events[] = [$txt, $date, $days, $color]; > public function __toString() < $num_days = date('t', strtotime($this->active_day . '-' . $this->active_month . '-' . $this->active_year)); $num_days_last_month = date('j', strtotime('last day of previous month', strtotime($this->active_day . '-' . $this->active_month . '-' . $this->active_year))); $days = [0 => 'Sun', 1 => 'Mon', 2 => 'Tue', 3 => 'Wed', 4 => 'Thu', 5 => 'Fri', 6 => 'Sat']; $first_day_of_week = array_search(date('D', strtotime($this->active_year . '-' . $this->active_month . '-1')), $days); $html = '
active_year . '-' . $this->active_month . '-' . $this->active_day)); $html .= '
'; $html .= '
'; $html .= '
'; > for ($i = $first_day_of_week; $i > 0; $i--) < $html .= '
' . ($num_days_last_month-$i+1) . '
'; > for ($i = 1; $i active_day) < $selected = ' selected'; >$html .= '
'; $html .= '' . $i . ''; foreach ($this->events as $event) < for ($d = 0; $d active_year . '-' . $this->active_month . '-' . $i . ' -' . $d . ' day')) == date('y-m-d', strtotime($event[1]))) < $html .= '
'; $html .= $event[0]; $html .= '
'; > > > $html .= '
'; > for ($i = 1; $i ' . $i . '
'; > $html .= '
'; $html .= '
'; return $html; > > ?>

Add the following code to your stylesheet (CSS) or create a new file calendar.css:

.calendar < display: flex; flex-flow: column; >.calendar .header .month-year < font-size: 20px; font-weight: bold; color: #636e73; padding: 20px 0; >.calendar .days < display: flex; flex-flow: wrap; >.calendar .days .day_name < width: calc(100% / 7); border-right: 1px solid #2c7aca; padding: 20px; text-transform: uppercase; font-size: 12px; font-weight: bold; color: #818589; color: #fff; background-color: #448cd6; >.calendar .days .day_name:nth-child(7) < border: none; >.calendar .days .day_num < display: flex; flex-flow: column; width: calc(100% / 7); border-right: 1px solid #e6e9ea; border-bottom: 1px solid #e6e9ea; padding: 15px; font-weight: bold; color: #7c878d; cursor: pointer; min-height: 100px; >.calendar .days .day_num span < display: inline-flex; width: 30px; font-size: 14px; >.calendar .days .day_num .event < margin-top: 10px; font-weight: 500; font-size: 14px; padding: 3px 6px; border-radius: 4px; background-color: #f7c30d; color: #fff; word-wrap: break-word; >.calendar .days .day_num .event.green < background-color: #51ce57; >.calendar .days .day_num .event.blue < background-color: #518fce; >.calendar .days .day_num .event.red < background-color: #ce5151; >.calendar .days .day_num:nth-child(7n+1) < border-left: 1px solid #e6e9ea; >.calendar .days .day_num:hover < background-color: #fdfdfd; >.calendar .days .day_num.ignore < background-color: #fdfdfd; color: #ced2d4; cursor: inherit; >.calendar .days .day_num.selected

How To Use

Include the class in your project and create a new instance.

include 'Calendar.php'; $calendar = new Calendar();

We can specify a date while creating a new instance:

include 'Calendar.php'; $calendar = new Calendar('2023-05-12');

Add new events to the calendar:

$calendar->add_event('Holiday', '2023-05-14');

We can specify the number of days the event should last by binding an additional value to the add_event method:

$calendar->add_event('Holiday', '2023-05-14', 7); // Event will last for 7 days

We can also change the color:

$calendar->add_event('Holiday', '2023-05-14', 7, 'red');

Only red, blue, and green will work (the default is orange). You can add more colors to the CSS file.

We can populate the calendar in HTML format with the following code:

Example Code

Create a new file example.php and add the following code:

add_event('Birthday', '2023-05-03', 1, 'green'); $calendar->add_event('Doctors', '2023-05-04', 1, 'red'); $calendar->add_event('Holiday', '2023-05-16', 7); ?>

The stylesheet (style.css) for our example page:

* < box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "segoe ui", roboto, oxygen, ubuntu, cantarell, "fira sans", "droid sans", "helvetica neue", Arial, sans-serif; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; >body < background-color: #FFFFFF; margin: 0; >.navtop < background-color: #3b4656; height: 60px; width: 100%; border: 0; >.navtop div < display: flex; margin: 0 auto; width: 800px; height: 100%; >.navtop div h1, .navtop div a < display: inline-flex; align-items: center; >.navtop div h1 < flex: 1; font-size: 24px; padding: 0; margin: 0; color: #ebedee; font-weight: normal; >.navtop div a < padding: 0 20px; text-decoration: none; color: #c4c8cc; font-weight: bold; >.navtop div a i < padding: 2px 8px 0 0; >.navtop div a:hover < color: #ebedee; >.content < width: 800px; margin: 0 auto; >.content h2

And now, if we navigate to our example page, it will appear similar to the following:

Event Calendar PHP

If you don’t see any events populated on the calendar, make sure the dates are correct, and your server timezone is set correctly. You can change the timezone with the below code.

date_default_timezone_set('America/Los_Angeles');

The full list of supported timezones are available here.

Conclusion

While the calendar class I’ve created is not a complete solution, it will most definitely help you integrate the class into any project seamlessly and extend the base code.

Drop a comment below and let me know if you encounter any issues with the class. Don’t forget to follow us on social media and share our articles, as this will help our website grow, and we can provide more quality content.

Released under the MIT License. If you’re going to redistribute the code, please include my name and link to this article. Thanks!

If you would like to support us, consider purchasing the advanced event calendar system below as it will greatly help us create more tutorials and keep our website up and running. The advanced package includes improved code and more features.

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