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For those out there looking for a quick way to check the load avarage of your server via a command line PHP script, and give you some output only if the load is higher than X, look at the following it might help.

In a terminal window, type the following:

vi checkLoadAvg.php

Now add the following lines to that file:

 
#!/usr/bin/php -f 
<?php  
$loadWarning = 3; 
$load = sys_getloadavg(); 
$hostname = trim(shell_exec('hostname')); 
if($load[0] > $loadWarning)
{ 
echo "Busy - Load Average detected on {$hostname} - Current Load: {$load[0]} (15min Avg: {$load[2]}) \n\n"; 
echo shell_exec('top -bn 1'); 
} ?> 

Save and quit ':wq', then add executable privileges to the file

chmod +x checkLoadAvg.php