<?php
foreach ([ 46.8, 36 * 1.3, 46.800000000000004, (36 * 1.3) . "" ] as $n)
  print ("$n " . print_r ($n, 1) . " " . json_encode ($n) . "\n");

46.8 46.8 46.8
46.8 46.8 46.800000000000004
46.8 46.8 46.800000000000004
46.8 46.8 "46.8"

<?php
echo number_format(36 * 1.3, 16);

prints

46.8000000000000043

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Reference:

1. PHP Playground