- pi: documentation ( source)
- pack: documentation ( source)
- printf: documentation ( source)
<?php
$mypi = 3.1415926535897932384626433832795028841971;
$pi = pi();
printf("pi: %.24f, %.24f, %.24f\n", $pi, $mypi, M_PI);
$l = strlen($mypi);
echo "l: $l\n";
$d = pack("d", $mypi);
$l = strlen($d);
echo "l: $d\n";