get next and previous day with PHP

Question

I have got two arrows set up, click for next day, next two days, soon and previous day, two days ago, soon. the code seem not working? as it only get one next and previous day.

<a href="home.php?date=<?= date('Y-m-d', strtotime('-1 day', strtotime($date))) ?>" class="prev_day" title="Previous Day" ></a>  <a href="home.php?date=<?= date('Y-m-d', strtotime('+1 day', strtotime($date))) ?>" class="next_day" title="Next Day" ></a> 

is there a way if i click the next button, the date will continously change for the next day. for a moment it will only get one day ahead

Answer 1

date('Y-m-d', strtotime('+1 day', strtotime($date))) 

Should read

date('Y-m-d', strtotime(' +1 day')) 

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Update to answer question asked in comment about continuously changing the date.

<?php $date = isset($_GET['date']) ? $_GET['date'] : date('Y-m-d'); $prev_date = date('Y-m-d', strtotime($date .' -1 day')); $next_date = date('Y-m-d', strtotime($date .' +1 day')); ?>  <a href="?date=<?=$prev_date;?>">Previous</a> <a href="?date=<?=$next_date;?>">Next</a> 

This will increase and decrease the date by one from the date you are on at the time.

Answer 2

Requirement: PHP 5 >= 5.2.0

You should make use of the DateTime and DateInterval classes in Php, and things will turn to be very easy and readable.

Example: Lets get the previous day.

// always make sure to have set your default timezone date_default_timezone_set('Europe/Berlin');  // create DateTime instance, holding the current datetime $datetime = new DateTime();  // create one day interval $interval = new DateInterval('P1D');  // modify the DateTime instance $datetime->sub($interval);  // display the result, or print_r($datetime); for more insight  echo $datetime->format('Y-m-d');   /**  * TIP: * if you dont want to change the default timezone, use * use the DateTimeZone class instead. * * $myTimezone = new DateTimeZone('Europe/Berlin'); * $datetime->setTimezone($myTimezone);  * * or just include it inside the constructor  * in this form new DateTime("now",   $myTimezone); */ 

References: Modern PHP, New Features and Good Practices By Josh Lockhart