php to js code example

Example 1: javascript php variable

<script type="text/javascript">
   var php_var = "<?php echo $php_var; ?>";
</script>

Example 2: php pass a variabele to js

<script>
'var name = <?php echo json_encode($name); ?>;
</script>'

Example 3: how to use php echo data in javascript

<?php
$php_variable = 'string'; //Define our PHP variable. You can of course get the value of this variable however you need.
?>			
        <script> js_variable_name = "<?php echo $php_variable; ?>";</script>

Example 4: php variable as javascript function parameter in echo

<?php echo "<script> autoFill(".$dropDown.", ".$emptyDropDown."); </script>"; ?>

Example 5: php into javascript

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

echo $str;

Example 6: 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);