js to php code example

Example 1: js var to php

<script>
   var res = "success";
</script>
<?php
   echo "<script>document.writeln(res);</script>";
?>

Example 2: how to use javascript variable in php

<script>
var p1 = "success";
</script>

<?php
echo "<script>document.writeln(p1);</script>";
?>

Example 3: php into javascript

$str = <<<MY_MARKER
<script type="text/javascript">
  document.write("Hello World!");
</script>
MY_MARKER;

echo $str;

Example 4: js to php

const toSend = {
            x: 10, 
            y: 12
        };
        const jsonString = JSON.stringify(toSend);
        const xhr = new XMLHttpRequest();

        xhr.open("POST", "file.php");
        xhr.setRequestHeader("Content-Type", "application/json");
        xhr.send(jsonString);
//php: 
$request = file_get_contents("php://input");
$obj = json_decode($request);
var_dump($obj);