Localhost/comparison operator.php

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<!DOCTYPE html>
<html>
<body>

</html>
<?php
$x = 10;  
echo $x;
?>  

</body>
    
</body>
</html>

Localhost/comparison operator.php

<!DOCTYPE html>
<html>
<body>

<</html>?php
$x = 10;  
echo $x;
?>  

</body>

Localhost/comparison operator.php

<?php
$b=40;
$a=40;
$c=$a+$b;

 $c;

$d=$c+$a;


            
$r=$c-$d;

 $r;

$c-$b;
  $b=$c;
$f=$b/$a;

$j=$d%$f;
echo $j;
?>

Localhost/comparison operator.php

<!DOCTYPE html>
<html>
<body>

</html>
<?php
$x = 10;  
echo $x;
?>  

</body>

Php ?:

// Example usage for: Ternary Operator
$action = $_POST['action'] ?: 'default';

// The above is identical to this if/else statement
if (empty($_POST['action'])) {
    $action = 'default';
} else {
    $action = $_POST['action'];
}

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