What is the safest way of passing arguments from server-side PHP to client-side JavaScript

Answers of > What is the safest way of passing arguments from server-side PHP to client-side JavaScript

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My favorite way is :

<?php

$var = array(
  'prop1' => 'value1',
  'prop2' => 'value2',
  // ...
);

?>
<script type="text/javascript">
   var varNameSpace = <?php echo json_encode($var); ?>;

   alert( varNameSpace.prop1 ); // -> 'value1'
</script>

Some example PHP:

$user = (object) array("name"=>"Joseph", "age"=>29, "email"=>"asdf@example.net");
echo '<script type="text/javascript"> var user = '.json_encode($user).'; </script>';

I would first create an API(write documentation) like for example

GET
http://localhost/getProfile?username=$username

POST
http://localhost/getProfile/$username

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