i have this php variable $post_price, and i want to pass it to that script,
 <script 
 data-transaction-total-amount=" what do i put here ?"></script>
i have this php variable $post_price, and i want to pass it to that script,
 <script 
 data-transaction-total-amount=" what do i put here ?"></script>
 
    
     
    
    Your question is far from clear, but I think you need:
<?php
$post_price = 111;
?>
<script data-transaction-total-amount="<?=$post_price;?>">
</script>
 
    
    You just need to use <?php echo $post_price; ?>
 <script 
     data-transaction-total-amount="<?php echo $post_price; ?>"></script>
