重新格式化php数组

我有这个阵列：

array ( 
    [0] => Chrome 35 (Lin) 
    [1] => Chrome 35 (Unk) 
    [2] => Chrome 35 (Unk) 
    [3] => Chrome 18 (Lin) 
    [4] )

我想得到每个唯一值的计数，如下所示：

[["Chrome 35 (lin)",1],["Chrome 35 (Unk)",2],["firefox",20]]

我真的不知道如何实现这一点，但我完全不知道这种格式。

试试这个：-

$counts = array_count_values($values);
$result = array_map(null, array_keys($counts), $counts);

echo json_encode($result);

$a = array("Chrome 35 (Lin)","Chrome 35 (Unk)", "Chrome 35 (Unk)", "Chrome 18 (Lin)", "Chrome 18 (Lin)", "Chrome 18 (Lin)", "Chrome 18 (Lin)", "Chrome 18 (Lin)");
$vals = array_count_values($a);
foreach($vals as $k=>$v){
    $c .= '["'.$k.'", '.$v.']'; 
}
echo "[".$c."]";