date - 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'))

---

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.