What role does the "opener" function play in PHP when dealing with popup windows?

The "opener" function in PHP is used to reference the window that opened the current window. This is commonly used when dealing with popup windows, as it allows communication between the parent window and the popup window. By using the "opener" function, you can pass data back and forth between the two windows, allowing for a more interactive user experience. 

// Parent window
<script>
function openPopup() {
    var popup = window.open("popup.php", "Popup", "width=400,height=400");
    popup.opener = window;
}
</script>

// Popup window (popup.php)
<?php
$data_from_parent = $_POST['data_from_parent'];
echo "Data from parent window: " . $data_from_parent;
?>

Keywords

opener function PHP popup windows JavaScript window object

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