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How can i convert the PHP string into an integer, but php string is fetched from javascript written in the same page? 

<!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>


source https://stackoverflow.com/questions/70488379/how-can-i-convert-the-php-string-into-an-integer-but-php-string-is-fetched-from

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