How can a PHP string be passed from a child window to a parent window in a PHP forum thread?

To pass a PHP string from a child window to a parent window in a PHP forum thread, you can use JavaScript to communicate between the windows. You can store the PHP string in a JavaScript variable in the child window and then use window.opener to access the parent window and pass the string to it. 

// Child window PHP code
<?php
$phpString = "Hello from child window!";
echo "<script>";
echo "var jsString = '" . $phpString . "';";
echo "window.opener.postMessage(jsString, '*');";
echo "</script>";
?>

// Parent window JavaScript code
<script>
window.addEventListener('message', function(event) {
  var receivedString = event.data;
  alert('Received string from child window: ' + receivedString);
});
</script>

Keywords

PHP string child window parent window forum thread

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