Counting data from array in object php -

i'm new in php.

when print_r($documents), system display:

array ( [0] => stdclass object ( [id] => 1 [title] => "aaa" [summary] => blablabla [score] => 100 [topic] => technology ) [1] => stdclass object ( [id] => 2 [title] => "bbb" [summary] => blablabla [score] => 86 [topic] => food ) [2] => stdclass object ( [id] => 3 [title] => "ccc" [summary] => blablabla [score] => 45 [topic] => technology ) [3] => stdclass object ( [id] => 4 [title] => "ddd" [summary] => blablabla [score] => 67 [topic] => technology ) [4] => stdclass object ( [id] => 5 [title] => "eee" [summary] => blablabla [score] => 88 [topic] => technology ))

i want count 'topic' , find highest 'score' on object, have result:

topic "technology" = 4 documents

topic "food" = 1 document

highest score = 100 in document "aaa"

what can foreach function?

foreach($documents $data) {     $id = $data->id;     $title = $data->title;     $score = $data->score;     $topic = $data->topic; } 

thanks help.

$top   = $documents[0]; // top element (with max score, assume first 1 default) $group = array();       // group buffer store document count  foreach($documents $data){    $topic = $data->topic;     // if topic in group    if(isset($group[$topic])){        $group[$topic]++;   // add 1 document    } else { // otherwise        $group[$topic] = 1; // set 1 document    }     // if $tops's score value lesser current $data's value    if($top->score < $data->score){        $top = $data; // there new top.    } }  var_dump($group, $top); 

you may aquire property of $top object. have group count each topic in $group array.