System Command and snmp commands

Hi All, I want to use system command to perform snmp queries on a remote machine and the problem is that I want to store the output /result in an Array , so that I can later use it for parsing purposes.I know I could use exec and passthru statements actually,But I am unable to store the result in the array or I am unsure whether the result is not getting stored in the array Here is the code <?php exec(' snmpget -v 2c -c public 10.103.16.14 sysUpTime.0',$ret); list($a)=split('[,]',$ret); echo $a[0]; ?> Point me , if any thing wrong in the code Please help me. Thanks, Nikhil.