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for($i = 0; $i <= 10_000; $i++) { 
    $ary[$i] = init_val($i);
}

$idx = 0;
for($i = 0; $i < 10_000; $i += 10) {
...
    $ary[$idx++] = init_val($idx);
...rest goes here...
}

$x = $y * 16;
$x = $y << 4; #Much faster

      $y * 26 
   == $y * 16 + $y * 8 + $y * 2 
   == $y << 4 + $y << 3 + $y << 1;