- printf: documentation ( source)
<?php
//method 1.
$tc = -0.07722108145106092170;
$F0 = 2.35555574349387919497;
$F1 = 8328.69142571908560057636;
$F2 = 0.00015455472302827120;
$F3 = 0.00000025033354424091;
$F4 = -0.00000000118633907768;
$arg = ((($F4 * $tc + $F3) * $tc + $F2) * $tc + $F1) * $tc + $F0;
printf("1. ARG: %20.15f\n", $arg);
//method 2.
$arg0 = $F0;
$arg1 = $F1 * $tc;
$arg2 = $F2 * $tc * $tc;
$arg3 = $F3 * $tc * $tc * $tc;
$arg4 = $F4 * $tc * $tc * $tc * $tc;
printf("2. ARG: %20.15f\n", $arg0+$arg1+$arg2+$arg3+$arg4);