How to use date() function in php

<?php
//backdate
$backdate= strtotime("-1 week");
echo date("d-m-y\n",$backdate);
//next date
$backdate= strtotime("+1 week");
echo date("d-m-y\n",$backdate);
//back 1 year
$backdate= strtotime("-1 year");
echo date("d-m-y\n",$backdate);
//next two week
$backdate= strtotime("+3 years");
echo date("d-m-y\n",$backdate);
?>

How to use explode and implode function

//explode function 

<?php
$string="WWW rootitech com";
$explode=explode(" ",$string);
$mini=2-2;
echo $explode[$mini];
 ?>

//explode and implode function

<?php
$string="www.rootitech.com";
$explode=explode(".",$string);
$implode=implode($explode,"@");
echo $implode;*/
?>

How to show limited content in php

<?php
$string="finch data software";

$mb_substr=mb_substr($string,0,8);
echo $mb_substr;
?>

How to setting PHP Sessions

Firstly   type this code and save set.php

<?php
session_start();
$_SESSION['username']='faridul';
?>

Secondly type this code and save view.php:

<?php
    session_start();
   
    if(isset($_SESSION['username'])){
        $seevariavle= $_SESSION['username'];
        echo 'Welcome,' .$seevariavle;
   
    }
    else{
        echo "Please log in.";
   
    }
?>

 Result: browsers show ----Welcome faridul.

Thirdly type this code and save unset.php :

<?php
    session_start();   
    unset($_SESSION['username']);
?>

You see result such step: 1.visit view.php then visit unset.php.
finally visit view.php see result "Please log in"

How to use $_GET variable

<?php
    if(isset($_GET['day']) && isset($_GET['date']) && isset($_GET['year'])){
       
        $day=$_GET['day'];
        $date=$_GET['date'];
        $year=$_GET['year'];
   
        if(!empty($day) && !empty ($date) && !empty ($year)){
            echo "ok";
        }
       
        else{
            echo "please fill the field";
        }
    }


?>

<form action ="get_variable.php" method="GET">
    Day: <br /><input type="text" name="day"><br />
    Date: <br /><input type="text" name="date"><br />
    Year: <br /><input type="text" name="year"><br /><br />
    <input type="submit" value="submit">
</form>

Top Oldest sports in the World ~ Come First Take News

Top Oldest sports in the World ~ Come First Take News

How to detect visitor's browsers

part 1:
<?php
    $browser= get_browser(null,true);
    print_r ($browser);

?> 
 part2:

<?php
    $browser= get_browser(null,true);
    echo $browser['browser'];

?>