What are potential issues when trying to pass variables from a form to a popup window in PHP?

One potential issue when passing variables from a form to a popup window in PHP is that the variables may not be properly transferred or accessed in the popup window. To solve this, you can use JavaScript to pass the variables from the form to the popup window by setting the window's location with the desired variables in the query string. 

<form method="post" action="popup.php" target="_blank" onsubmit="return openPopup()">
    <input type="text" name="variable1">
    <input type="submit" value="Submit">
</form>

<script>
function openPopup() {
    var variable1 = document.querySelector('input[name="variable1"]').value;
    window.open('popup.php?variable1=' + variable1, '_blank');
    return false;
}
</script>

Keywords

form popup window variables PHP passing

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