如何查看php中已按下哪个按钮？

Question

I'm quite new to php so this might seem very easy. I have a table called 'products' and for each product in that table I want to create a button with the id of that product. I have no problem creating the buttons but I can not see which of the buttons has been pressed.

How can I solve this?

This is my code:

$sql = "SELECT id FROM `products` WHERE subcategory = 'laptop' ORDER BY id desc limit 1";
$query = mysql_query($sql);
$id = mysql_result($query,0);
for($i=1; $i<= $id; $i++){  
    $product2 = R::load('products', $i);
    echo "<input type='submit' name='$product2->id' value='Add to cart'/>";
}

Thank you !

Answer 1

assign a value to the button/input

<input type="submit" name="btn" value="button1" />
<input type="submit" name="btn" value="button2" />
<input type="submit" name="btn" value="button3" />


<?php echo filter_input(INPUT_POST, 'btn'); ?>

or

<input type="submit" name="btn1" value="button1" />
<input type="submit" name="btn2" value="button2" />
<input type="submit" name="btn3" value="button3" />


<?php if (filter_has_var(INPUT_POST, 'btn1')) { echo "button 1 clicked"; } ?>