(PHP3 >= 3.0.7, PHP4 >= 4.0b2)
getrusage -- Get the current resource usages.
Description
array getrusage ([int 
       who])
     This is an interface to getrusage(2). It returns an associative
     array containing the data returned from the system call. If who
     is 1, getrusage will be called with RUSAGE_CHILDREN.
    
     All entries are accessible by using their documented field names.
     
Example 1. Getrusage Example 
$dat = getrusage();
echo $dat["ru_nswap"];         # number of swaps
echo $dat["ru_majflt"];        # number of page faults
echo $dat["ru_utime.tv_sec"];  # user time used (seconds)
echo $dat["ru_utime.tv_usec"]; # user time used (microseconds)
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     See your system's man page for more details.