The following functions affect the operation of PHP. Some of them alter configuration variables. Others cause a script to stop executing for a period.
The bcscale function (Listing 15.1) sets the default scale for the functions that perform math on arbitrary-precision numbers. The scale is the number of digits after the decimal point. See the section on arbitrary-precision numbers in Chapter 13.
<?php //use ten digits bcscale(10); ?>
Calling C's stat function (Listing 15.2) may take a considerable amount of time. To increase performance, PHP caches the results of each call. When you use a function that relies on stat, the information from the cache is ...