database - How can I see which button has been pressed in php? -

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i'm quite new php might seem easy. have table called 'products' , each product in table want create button id of product. have no problem creating buttons can not see of buttons has been pressed.

how can solve this?

this code:

$sql = "select id `products` subcategory = 'laptop' order 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 cart'/>"; }

thank !

assign value 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"; } ?>

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