<!DOCTYPE html>
<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>if else in php</title>
</head>
<body>
<script>
var a = 123;
//to send the prompt value to php, reference taken from stack overflow
</script>
<?php
$a = "<script>document.writeln(a)</script>";
echo $a;
?>
</body>
</html>
in the code above, i fetched the value of javascript variable 'a' in PHP i successfully get it in the variable $a and i tried to print it then also it got printed successfully. As $a would be containing number '123' in string i tried to convert it into an integer using intval() function but, it always shows me value of $a as 0 when i echo it. the below code describes the same
<!DOCTYPE html>
<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>if else in php</title>
</head>
<body>
<script>
var a = 123;
//to send the prompt value to php, reference taken from stack overflow
</script>
<?php
$a = "<script>document.writeln(a)</script>";
$a = intval($a);
echo $a;
?>
</body>
</html>
You have to submit it to the server to process it. Here a working example.
<?php
$canDrive = false;
// use GET to retrieve the value of the "age" query string
if(isset($_GET["age"]) && $_GET["age"] >= 18) $canDrive = true;
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>if else in php</title>
</head>
<body>
<!-- Here goes your code -->
<?php
if ($canDrive) {
echo "You can drive";
} else {
echo "You can't drive";
}
?>
<form action="" method="get">
<input type="text" name="age" id="">
<input type="submit" value="submit">
</form>
</body>
</html>
Remember, JavaScript and PHP can't communicate directly.