When you read the first line, split the data into it's components , then assign each value to a variable. Call them: $octet_1,$unix_time_1 etc. Now, start the loop. Inside the loop, read the next line, assign to $octet_2, $unix_time_2 etc. Do your calculations ( $answer = $octet_2 - $octet_1 etc. ) Now, before exiting the loop: $octet_1 = $octet_2; $unix_time_1 = $unix_time_1; etc
On Mon, 2003-01-06 at 15:51, Christopher J. Crane wrote: > Ok, this is the first time I will post a message without a line of code. I > am not sure how to go about this task. So I will describe it and maybe > someone will have some thoughts. > > I use PHP to connect to our many routers and get data using snmp. I have > written a script that refreshes itself every 10 secs. It writes the data to > a text file. The key element of this data is the Octet counters, or the > amount of data that has been transfered both in and out. To keep it simple, > I will only talk about outs. In order to find the amount od data being > transfered, I have to compare two lines. Then run a calculation on that and > then push that data into an array to plot on a chart later on. > > Here is an example of the file the data is written to: > OctetsIn:4300492881|OctetsOut:4300544503|UnixTime:1041629017 > OctetsIn:4305184236|OctetsOut:4305234971|UnixTime:1041629031 > OctetsIn:4308716675|OctetsOut:4308782481|UnixTime:1041629044 > OctetsIn:4312595737|OctetsOut:4312685815|UnixTime:1041629058 > OctetsIn:4315910414|OctetsOut:4315961443|UnixTime:1041629072 > OctetsIn:4318948400|OctetsOut:4318975102|UnixTime:1041629085 > OctetsIn:4322040239|OctetsOut:4322091605|UnixTime:1041629098 > OctetsIn:4324981522|OctetsOut:4325033235|UnixTime:1041629111 > OctetsIn:4327971528|OctetsOut:4328029496|UnixTime:1041629125 > OctetsIn:4332318792|OctetsOut:4332379277|UnixTime:1041629138 > OctetsIn:4335594241|OctetsOut:4335635318|UnixTime:1041629153 > OctetsIn:4339008729|OctetsOut:4339048246|UnixTime:1041629166 > OctetsIn:4342539875|OctetsOut:4342591776|UnixTime:1041629180 > OctetsIn:4346070439|OctetsOut:4346127821|UnixTime:1041629193 > OctetsIn:4350288360|OctetsOut:4350355417|UnixTime:1041629206 > > I can open the file and read the contents line by line > split up but the delimiters and get the data I need....but this is what has > to happen. > If PHP is on line 1, do nothing (it's needs two lines to compare against) > > If it's on line 2, then subtract Line 1, OctetsOut from Line Line 2 > OctetsOut. Then do the same with the UnixTime. Now run a calculation on that > data and push that into an array as the first data point. Now move on, with > a loop I would assume, and do the same for lines 2 and 3, and so on, until > we reach the end. > > There could be 5 lines or 500 lines..... > > I can loop through the file and do everything, the biggest problem I am > having is getting the data on the line PHP is currently on, and then > subtracting the line prior to it. I just can't seem to get a grasp on it. > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
