I have two files. index.php and cart.php. All my functions, connection to database, etc.

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Asked: June 14, 20262026-06-14T04:53:24+00:00 2026-06-14T04:53:24+00:00

I have two files. index.php and cart.php. All my functions, connection to database, etc.

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I have two files. index.php and cart.php. All my functions, connection to database, etc. are located at file cart.php. There are functions that I want to call out if user clicks on a HREF link.

my index.php:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
    <div id="wrapper" align="center" style="width:90%; height:auto; margin-left:auto; margin-right:auto;">      
    <?php cart(); ?>
    <br><br>
        <div id="sidebar" align="left" style="width:15%; height:auto; background-color:#999999; float:left;">
            <ul style="list-style-type:none;">
                <li><a href="#" id="all">ALL</a></li>
                <li><a href="#" id="shirts">SHIRTS</a></li>
                <li><a href="#" id="hoodies">HOODIES</a></li>
        </ul>
        </div>
        <div id="products" style="width:85%; height:auto; background-color:#888888; float:left;">
            <?php
            products_all();
            ?>
        </div>
    </div>
</body>
</html>

Then, How can I make that a HREF link calls out a specific function(which is located in cart.php) and displays it inside a div tag(in my case, in div id=”products”)?

It’s probably easy, I am just a beginner.

Here’s my cart.php just in case.

<?php

session_start();


$page = 'index.php';

// ***
/*
$mysql_host = "***";
$mysql_database = "***";
$mysql_user = "***";
$mysql_password = "***";
*/

// localhost
$mysql_host = "localhost";
$mysql_database = "cartt";
$mysql_user = "root";
$mysql_password = "";

mysql_connect($mysql_host, $mysql_user, $mysql_password) or die(mysql_error());
mysql_select_db($mysql_database) or die(mysql_error());

if (isset($_GET['add'])) {
    $quantity = mysql_query('SELECT id, quantity FROM products WHERE id='.mysql_real_escape_string((int)$_GET['add']));
    while ($quantity_row = mysql_fetch_assoc($quantity)) {
        if ($quantity_row['quantity']!=$_SESSION['cart_'.(int)$_GET['add']]) {
            $_SESSION['cart_'.(int)$_GET['add']]+='1';

        }
    }
    header('Location: '.$page); 
}

if (isset($_GET['remove'])) {
    $_SESSION['cart_'.(int)$_GET['remove']]--;
    header('Location: '.$page); 
}

if (isset($_GET['delete'])) {
    $_SESSION['cart_'.(int)$_GET['delete']]='0';
    header('Location: '.$page); 
}

function products_all() {
    $get_all = mysql_query('SELECT id, name, description, price FROM products ORDER BY id DESC');

        if (mysql_num_rows($get_all)==0) {
            echo "There are no products to display!";
        }
        else {                                      
            echo '<table width="900px" allign="center" cellpadding ="5" style="background-color:transparent;">
                  <tr align="center" valign="middle">';

                  $i = 0;

            while ($get_row = mysql_fetch_assoc($get_all)) {

                echo '<td><img src="./cartimages/'.$get_row['id'].'.jpeg" alt=" " height="225px" align="center"><br />'.$get_row['name'].'<br />'.$get_row['description'].'<br />&pound'.number_format($get_row['price'], 2).'<br /><a href="cart.php?add='.$get_row['id'].'">Add</a></td>';                

                $i++;
                if ($i == 4) {
                    echo '</tr>
                          <tr align="center" valign="middle">';
                          $i = 0;
                }


            }
        }
    }

function products_shirts() {

    $get_shirts = mysql_query('SELECT id, name, description, price FROM products WHERE type = "shirt" ORDER BY id DESC');

        if (mysql_num_rows($get_shirts)==0) {
            echo "There are no products to display!";
        }
        else {                                      
            echo '<table width="900px" allign="center" cellpadding ="5" style="background-color:transparent;">
                  <tr align="center" valign="middle">';

                  $i = 0;

            while ($get_row = mysql_fetch_assoc($get_shirts)) {

                echo '<td><img src="./cartimages/'.$get_row['id'].'.jpeg" alt=" " height="225px" align="center"><br />'.$get_row['name'].'<br />'.$get_row['description'].'<br />&pound'.number_format($get_row['price'], 2).'<br /><a href="cart.php?add='.$get_row['id'].'">Add</a></td>';                

                $i++;
                if ($i == 4) {
                    echo '</tr>
                          <tr align="center" valign="middle">';
                          $i = 0;
                }


            }
        }
    }

function products_hoodies() {
$get_hoodies = mysql_query('SELECT id, name, description, price FROM products where type = "hoodie" ORDER BY id DESC');

        if (mysql_num_rows($get_hoodies)==0) {
            echo "There are no products to display!";
        }
        else {                                      
            echo '<table width="900px" allign="center" cellpadding ="5" style="background-color:transparent;">
                  <tr align="center" valign="middle">';

                  $i = 0;

            while ($get_row = mysql_fetch_assoc($get_hoodies)) {

                echo '<td><img src="./cartimages/'.$get_row['id'].'.jpeg" alt=" " height="225px" align="center"><br />'.$get_row['name'].'<br />'.$get_row['description'].'<br />&pound'.number_format($get_row['price'], 2).'<br /><a href="cart.php?add='.$get_row['id'].'">Add</a></td>';                

                $i++;
                if ($i == 4) {
                    echo '</tr>
                          <tr align="center" valign="middle">';
                          $i = 0;
                }


            }
        }
    }


function paypal_items() {
    $num = 0;
    foreach($_SESSION as $name => $value) {
        if ($value!=0) {
            if (substr($name, 0 , 5)=='cart_') {
                $id = substr($name, 5, strlen($name)-5);
                $get = mysql_query('SELECT id, name, price, shipping FROM products WHERE id='.mysql_real_escape_string((int)$id));
                while ($get_row = mysql_fetch_assoc($get)) {
                    $num++;
                    echo '<input type="hidden" name="item_number_'.$num.'" value="'.$id.'">';
                    echo '<input type="hidden" name="item_name_'.$num.'" value="'.$get_row['name'].'">';
                    echo '<input type="hidden" name="amount_'.$num.'" value="'.$get_row['price'].'">';
                    echo '<input type="hidden" name="shipping_'.$num.'" value="'.$get_row['shipping'].'">';
                //  echo '<input type="hidden" name="shipping2_'.$num.'" value="'.$get_row['shipping'].'">';
                    echo '<input type="hidden" name="quantity_'.$num.'" value="'.$value.'">';
                }
            }   
        }
    }
}

function cart() {
    $total = 0;
    foreach($_SESSION as $name => $value) {
        if ($value>0) {
            if (substr($name, 0, 5)=='cart_') {
                $id = substr($name, 5, (strlen($name)-5));
                $get = mysql_query('SELECT id, name, price FROM products WHERE id='.mysql_real_escape_string((int)$id));
                while ($get_row = mysql_fetch_array($get)) {
                    $sub = $get_row['price']*$value;
                    echo $get_row['name'].' x '.$value.' @ &pound;'.number_format($get_row['price'], 2).' = &pound;'.number_format($sub, 2).'<a href="cart.php?remove='.$id.'">[-]</a> <a href="cart.php?add='.$id.'">[+]</a> <a href="cart.php?delete='.$id.'">[Delete]</a><br />';
                }
            }
            $total += $sub;
        }
    }
    if ($total==0) {
        echo "Your cart is empty.";
    }
    else {
        echo '<p>Total: &pound;'.number_format($total, 2).'</p>';

        ?>
        <p>
        <form action="https://www.paypal.com/cgi-bin/webscr" method="post">
        <input type="hidden" name="cmd" value="_cart">
        <input type="hidden" name="upload" value="1">
        <input type="hidden" name="business" value="*************">
        <?php paypal_items(); ?>        
        <input type="hidden" name="currency_code" value="GBP">
        <input type="hidden" name="amount" value="<?php echo $total; ?>">
        <input type="image" src="http://www.paypal.com/en_US/i/btn/x-click-but03.gif" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
        </form>
        </p>
        <?php


    }
}

?>

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1 Answer

Editorial Team · Answer 1 · 2026-06-14T04:53:25+00:00

If you want a php function to run when you do something on the client, you have to make an AJAX request that calls that function, then you insert the HTML dynamically when your AJAX request returns.

Remember that PHP only generates text that is sent over the wire as HTML,CSS,JavaScript,JSON, XML,… There is no way for PHP to interact directly with your page, it can only generate new content

Here’s a basic AJAX example you could use; I’ll use jQuery and some simplified PHP code

ajax.php

function doit() { echo "anything"; }
doit();

page.html

<a href="#" id="mylink"> Load stuff </a>
<div id="products"></div>

page.js

$("#mylink").click(function() { 
    $('#products').load("/ajax.php");
})

That code loads the result of doit in ajax.php into the div with id “products” when you click on the link with ID “page.html”

http://api.jquery.com/load/

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