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.
    
     
例子 1. getrusage() example 
<?php $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 on getrusage(2) for more details.