- memory_get_usage: documentation ( source)
- array_fill: documentation ( source)
- printf: documentation ( source)
<?php
$mem = memory_get_usage();
$a = array_fill( 0, 131072, 0 );
$mema = memory_get_usage() - $mem;
$b = 1 ? $a : 0;
$memb = memory_get_usage() - $mem;
printf( '%1.1f', $memb / $mema );