php stripping a particular result from an output - php

Question

I am using php to grab a shell output that lists all the meetme channels for me. I just want to grab the Conf Num that has 0001 from the bottom up. In my example below, I would like to assign variable: $confnum="32";
Here is my code so far:
$output = shell_exec("asterisk -rx 'meetme list'");
echo $output;
Please help me take the results from $output.
Here's what you'll get when executing the meet.php file
[root#C1033-TF agi-bin]# php meet.php
Conf Num Parties Marked Activity Creation Locked
67 0001 N/A 00:00:16 Dynamic No
28 0001 N/A 00:00:19 Dynamic No
65 0001 N/A 00:01:14 Dynamic No
42 0001 N/A 00:01:18 Dynamic No
32 0001 N/A 00:04:18 Dynamic No
* Total number of MeetMe users: 5
Please keep in mind that sometime there will be more than just 0001 Parties in the Conf Num. In the example above, I just want to grab the line:
32 0001 N/A 00:04:18 Dynamic No
This is the last line that has 0001 therefore assign $confnum="32"; to it.
Any kind of help I can get on this is greatly appreciated.

Answer 1

You can use exec instead of shell_exec and iterate through the output lines:
<?php
$output = array();
exec("asterisk -rx 'meetme list'", $output);
foreach ($output as $line) {
if (preg_match('/^32\s/', $line)) { //Check line starts with 32
echo $line;
}
}
Edit:
<?php
$output = array();
exec("asterisk -rx 'meetme list'", $output);
$lines = sizeof($output);
for ($i = $lines -1; $i >=0 ; $i--) {
if (preg_match('/^(\d+)\s+0001\s/', $output[$i], $matches)) { //Check line contains 0001
$firstNumber = $matches[1];
echo $firstNumber;
break;
}
}

Answer 2

Okay, assuming Linux, you can do this purely in shell:
filter last line: grep -v 'Total number of MeetMe isers'
filter first line: grep -v 'Conf Num'
and print only one Conf Num: awk 'BEGIN{ result=""; } {if( $2 == "0001"){result=$1;}} END {print result;}'
So the whole code:
$output = shell_exec("asterisk -rx 'meetme list' | grep -v 'Total number of MeetMe isers' | grep -v 'Conf Num' | awk 'BEGIN{ result=\"\"; } {if( \$2 == \"0001\"){result=$1;}} END {print result;}'");
// $output should contain your data :)
Or use preg_match_all():
$output = shell_exec("asterisk -rx 'meetme list'");
$matches = array();
$result = null;
preg_match_all('~^\s*(\\d+)\\s+0001~', $output, $matches, PREG_SET_ORDER);
foreach( $matches as $match ){
$result = $match[1];
}
In reaction to comment:
You should study regular expression syntax and meaning of \d and +. \d+ will match 0, 01 or 00000000000000000000000000000000 :).