how to get only the value of an array PHP prestashop 1.7

[xbKappa]

I have this code for counting product attributes 

$getProductAttributes = Db::getInstance()->executeS('SELECT COUNT(id_product_attribute) FROM '._DB_PREFIX_.'product_attribute WHERE id_product = '.$id_product.'');

print_r($getProductAttributes);

 

and is printing this  Array ( [0] => Array ( [COUNT(id_product_attribute)] => 90 ) )

how can i get only the value 90?

 

[Rhobur]

It should be like this,
 

$getProductAttributes = Db::getInstance()->executeS('SELECT COUNT(id_product_attribute) FROM `'._DB_PREFIX_.'product_attribute` WHERE id_product='.(int)$id_product);
print_r($getProductAttributes, true);

then get the value from array.

Edited October 26, 2021 by Rhobur
clarity (see edit history)

[coeos.pro]

Don't use executeS but getValue : 

 

$getProductAttributes = Db::getInstance()->getValue ('SELECT COUNT(id_product_attribute) FROM '._DB_PREFIX_.'product_attribute WHERE id_product = '.(int)$id_product);

and then $getProductAttributes  = 90

for security, don't forget (int) before $id_product