MySQL based variable coming up as NULL in PHP -

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the following code in php file building. building dynamic form show product names , other information in html divs. now, coming problem, think relatively simple. trying echo $name; coming empty, put in test echo see if perhaps echoing different place had expected, nope, test came right up. so, did var_dump($name); , came null. define in line before echo it, why coming null? 

<?php $productquery = mysqli_query($connection, 'select * products pid="$productid"'); $productrow = mysqli_fetch_assoc($productquery); //$dbidlogin = $row5['id'];          ?>  <?php  $name = $productrow['productname']; echo var_dump($name); echo "<br>why?"; ?>

update:

vardump($productrow['productname']) null.

vardumping $productquery gives this:

object(mysqli_result)#2 (5) { ["current_field"]=> int(0) ["field_count"]=> int(18) ["lengths"]=> null ["num_rows"]=> int(0) ["type"]=> int(0) }

2nd update:

apparently $productid null. i'm trying set 4. have this, , still doesn't works. i've tried surrounding 4 in quotes, single , double, isn't problem. still says null line after define it.

$productid=4; $productquery = mysqli_query($connection, 'select * products pid="$productid"'); $productrow = mysqli_fetch_assoc($productquery);

$productrow['productname'] null.

figure out query returning vardump/print_r statement $productrow


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