The running php script from the console eats up a lot of memory, why?

Question

linux

Script Code

<?php
sleep(10);
die();
?>

It just starts up and sleeps.
I run this script 100 times with another script via command line

for($i=0;$i<100;$i++){
    system("php7 ../../web/console.php > /dev/null &");
}

And this code eats up about 700 MB of RAM
Why does such a simple script "eat up" so much memory?

Answer 1

RAM eats not sleep, but running processes of PHP interpreters in the amount of 100 pieces.
To confirm my words, you can open htop, and in the next window execute: (launch php interactive mode in the background 100 times)
for i in {1..100}; do php -a & done;