How do I pass SELECT PHP to Javascript?

Question

I am new to PHP. Please advise me on how to use PHP in Javascript. My 1st Code sys_out_currency to put in the second code USD: 0.2493,

1st Code

<?php
$sql = mysql_query("SELECT * FROM sys_currency_buy");
while($row = mysql_fetch_array($sql)) {
?> 
<p><?php echo $row['sys_out_currency']; ?></p>
<p><?php echo $row['sys_in_currency']; ?></p>
<?php } ?>

2nd Code

<script>
var MYRrates = {
USD: 0.2493, 
SGD: 0.3355, 
GBP: 0.1908, 
EUR: 0.2247, 
AUD: 0.3663, 
NZD: 0.3802, 
CAD: 0.3257, 
CHF: 0.2421, 
HKD: 1.94, 
CNY: 1.72, 
NT: 7.54, 
THB: 7.57,   
PHP: 13.33, 
INR: 18.34, 
SAR: 0.94, 
JPY: 273.9,   
KRW: 295.8, 
VND: 5700, 
IDR: 3400,     
};

Answer 1

This is the way how you can use PHP inside javascript :

<script type='text/javascript'>
    function test() {
        alert("<?php echo "Testing"; ?>");
    }
    test();// to call the function
</script> 

Answer 2

PHP in JavaScript code can't be called. But JavaScript code can be called in PHP. You can use AJAX call for this purpose.