If this is the array
$array = Array(
Array(
'type' => 'Person',
'relevance' => .7,
'count' => 300,
'text' => 'Chris'
),
Array(
'type' => 'Person',
'relevance' => .9,
'count' => 400,
'text' => 'Chris'
),
Array(
'type' => 'Person',
'relevance' => .5,
'count' => 200,
'text' => 'Tom'
),
);
then:
$tmp = Array();
foreach($array as $obj) {
if(!isset($tmp[$obj['text']])) {
$tmp[$obj['text']] = array_merge(Array('total_count'=>1),$obj);
continue;
}
$tmp[$obj['text']]['count'] += $obj['count'];
$tmp[$obj['text']]['relevance'] += $obj['relevance'];
$tmp[$obj['text']]['total_count']++; // useful for average calculation
}
$result = Array();
foreach($tmp as $key=>$obj) {
$obj['relevance'] = $obj['relevance']/$obj['total_count'];
unset($obj['total_count']); // useless now
$result[] = $obj;
}
print_r($result);