getrusage
    (PHP 3>= 3.0.7, PHP 4 )
getrusage -- Gets 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)  |  
  | 
     See your system's man page on getrusage(2) for more details.