Every time I try to run this code there is a message saying:

    Fatal error: Call to undefined function money_format()

The lines that have that problem are:

    $pricetotal = money_format(&quot;%10.2n&quot;, $pricetotal);
and

    $cartTotal = money_format(&quot;%10.2n&quot;, $cartTotal);

Can you please explain me the reason why this happens ?

    $cartOutput = &quot;&quot;;
    $cartTotal = &quot;&quot;;
    $pp_checkout_btn = &#39;&#39;;
    $product_id_array = &#39;&#39;;
    if (!isset($_SESSION[&quot;cart_array&quot;]) || count($_SESSION[&quot;cart_array&quot;]) &lt; 1) {
        $cartOutput = &quot;&lt;h2 align=&#39;center&#39;&gt;Your shopping cart is empty&lt;/h2&gt;&quot;;
    } else {
	    // Start PayPal Checkout Button
	$pp_checkout_btn .= &#39;&lt;form action=&quot;https://www.paypal.com/cgi-bin/webscr&quot; method=&quot;post&quot;&gt;
        &lt;input type=&quot;hidden&quot; name=&quot;cmd&quot; value=&quot;_cart&quot;&gt;
        &lt;input type=&quot;hidden&quot; name=&quot;upload&quot; value=&quot;1&quot;&gt;
        &lt;input type=&quot;hidden&quot; name=&quot;business&quot; value=&quot;you@youremail.com&quot;&gt;&#39;;
	    // Start the For Each loop
	    $i = 0; 
        foreach ($_SESSION[&quot;cart_array&quot;] as $each_item) { 
		    $item_id = $each_item[&#39;item_id&#39;];
		    $sql = mysql_query(&quot;SELECT * FROM products WHERE id=&#39;$item_id&#39; LIMIT 1&quot;);
		    while ($row = mysql_fetch_array($sql)) {
			    $product_name = $row[&quot;product_name&quot;];
			    $price = $row[&quot;price&quot;];
			    $details = $row[&quot;details&quot;];
		    }
		    $pricetotal = $price * $each_item[&#39;quantity&#39;];
		    $cartTotal = $pricetotal + $cartTotal;
		    setlocale(LC_MONETARY, &quot;en_US&quot;);
            $pricetotal = money_format(&quot;%10.2n&quot;, $pricetotal);
		    // Dynamic Checkout Btn Assembly
		    $x = $i + 1;
		    $pp_checkout_btn .= &#39;&lt;input type=&quot;hidden&quot; name=&quot;item_name_&#39; . $x . &#39;&quot; value=&quot;&#39; . $product_name . &#39;&quot;&gt;
            &lt;input type=&quot;hidden&quot; name=&quot;amount_&#39; . $x . &#39;&quot; value=&quot;&#39; . $price . &#39;&quot;&gt;
            &lt;input type=&quot;hidden&quot; name=&quot;quantity_&#39; . $x . &#39;&quot; value=&quot;&#39; . $each_item[&#39;quantity&#39;] . &#39;&quot;&gt;  &#39;;
		    // Create the product array variable
		    $product_id_array .= &quot;$item_id-&quot;.$each_item[&#39;quantity&#39;].&quot;,&quot;; 
		    // Dynamic table row assembly
		    $cartOutput .= &quot;&lt;tr&gt;&quot;;
		    $cartOutput .= &#39;&lt;td&gt;&lt;a href=&quot;product.php?id=&#39; . $item_id . &#39;&quot;&gt;&#39; .     $product_name . &#39;&lt;/a&gt;&lt;br /&gt;&lt;img src=&quot;inventory_images/&#39; . $item_id . &#39;.jpg&quot; alt=&quot;&#39; . $product_name. &#39;&quot; width=&quot;40&quot; height=&quot;52&quot; border=&quot;1&quot; /&gt;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;td&gt;&#39; . $details . &#39;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;td&gt;$&#39; . $price . &#39;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;td&gt;&lt;form action=&quot;cart.php&quot; method=&quot;post&quot;&gt;
		&lt;input name=&quot;quantity&quot; type=&quot;text&quot; value=&quot;&#39; . $each_item[&#39;quantity&#39;] . &#39;&quot; size=&quot;1&quot; maxlength=&quot;2&quot; /&gt;
		&lt;input name=&quot;adjustBtn&#39; . $item_id . &#39;&quot; type=&quot;submit&quot; value=&quot;change&quot; /&gt;
		&lt;input name=&quot;item_to_adjust&quot; type=&quot;hidden&quot; value=&quot;&#39; . $item_id . &#39;&quot; /&gt;
		&lt;/form&gt;&lt;/td&gt;&#39;;
		//$cartOutput .= &#39;&lt;td&gt;&#39; . $each_item[&#39;quantity&#39;] . &#39;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;td&gt;&#39; . $pricetotal . &#39;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;td&gt;&lt;form action=&quot;cart.php&quot; method=&quot;post&quot;&gt;&lt;input name=&quot;deleteBtn&#39; . $item_id . &#39;&quot; type=&quot;submit&quot; value=&quot;X&quot; /&gt;&lt;input name=&quot;index_to_remove&quot; type=&quot;hidden&quot; value=&quot;&#39; . $i . &#39;&quot; /&gt;&lt;/form&gt;&lt;/td&gt;&#39;;
		$cartOutput .= &#39;&lt;/tr&gt;&#39;;
		$i++; 
    } 
	setlocale(LC_MONETARY, &quot;en_US&quot;);
    $cartTotal = money_format(&quot;%10.2n&quot;, $cartTotal);
	$cartTotal = &quot;&lt;div style=&#39;font-size:18px; margin-top:12px;&#39; align=&#39;right&#39;&gt;Cart Total : &quot;.$cartTotal.&quot; USD&lt;/div&gt;&quot;;
    // Finish the Paypal Checkout Btn
	$pp_checkout_btn .= &#39;&lt;input type=&quot;hidden&quot; name=&quot;custom&quot; value=&quot;&#39; . $product_id_array . &#39;&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;notify_url&quot; value=&quot;https://www.yoursite.com/storescripts/my_ipn.php&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;return&quot; value=&quot;https://www.yoursite.com/checkout_complete.php&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;rm&quot; value=&quot;2&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;cbt&quot; value=&quot;Return to The Store&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;cancel_return&quot; value=&quot;https://www.yoursite.com/paypal_cancel.php&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;lc&quot; value=&quot;US&quot;&gt;
	&lt;input type=&quot;hidden&quot; name=&quot;currency_code&quot; value=&quot;USD&quot;&gt;
	&lt;input type=&quot;image&quot; src=&quot;http://www.paypal.com/en_US/i/btn/x-click-but01.gif&quot; name=&quot;submit&quot; alt=&quot;Make payments with PayPal - its fast, free and secure!&quot;&gt;
	&lt;/form&gt;&#39;;
    }
    ?&gt;

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Fatal error: Call to undefined function money_format()