Solution No 1
<?php
header('Access-Control-Allow-Origin: *');
-------
------
-------
your code
--------
?>
Solution No 2
<?php
header('content-type: application/json; charset=utf-8');
header("access-control-allow-origin: *");
?>
Solution No 3
<?php
header('Content-type: text/html');
header('Access-Control-Allow-Origin: *');
?>

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