PHP Function for parsing vmstat output

vmstat-parser.php

<?php

// TEST

// $res[] = "procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----";
// $res[] = " r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa";
// $res[] = " 0  0      0  10376 148188 291056    0    0     4    29   85    9  1  0 98  1";
// // or
// // exec('vmstat', $res);
// print_r(parseVMStatOutput($res));

function parseVMStatOutput($lines) {
  $titles = explode(' ', $lines[0]);
  foreach ($titles as $n => $_t) {
		$titles[$n] = array(
			'name'=>trim($_t, '-'),
			'len'=>strlen($_t)
		);
	}

	$subtitleLine = $lines[1];
	foreach ($titles as $n => $_t) {
		$subtitles = substr($subtitleLine, 0, $_t['len']);
		$subtitleLine = substr($subtitleLine, $_t['len']+1);
		preg_match_all('/(?:[ \t]*([0-9a-zA-Z]+))/', $subtitles, $subtitleMatch);
		$titles[$n]['subtitles'] = $subtitleMatch[1];
	}
	$results = array();
	for ($i = 2; $i<count($lines); $i++) {
		preg_match_all('/(?:[ \t]*([0-9a-zA-Z]+))/', $lines[$i], $valuesMatch);
		$values = $valuesMatch[1];
		$_line = array();
		$j = 0;
		foreach ($titles as $_t) {
			foreach ($_t['subtitles'] as $_s) {
				$_line[$_t['name']][$_s] = $values[$j++];
			}
		}
		$results[] = $_line;
	}

	return count($results)==1 ? $results[0] : $results;
}

poor function
i catch only 9 parameters from 19

Array
(
[procs] => Array
(
[r] => 0
[b] => 0
[w] => 0
)

[memory] => Array
    (
        [vm] => 4866940
    )

[page] => Array
    (
        [flt] => 1355908
    )

[disks] => Array
    (
        [r] => 545
        [da0] => 0
    )

[faults] => Array
    (
        [in] => 0
    )

[cpu] => Array
    (
        [us] => 0
    )

)

and if u using regex, it is poor performance

see my script mishanon/parser-vmstat@339e7a5

thanks