使用array_count_values​​

$array = array('apple', 'orange', 'pear', 'banana', 'apple',
'pear', 'kiwi', 'kiwi', 'kiwi');

print_r(array_count_values($array));

将输出

Array
(
   [apple] => 2
   [orange] => 1
   [pear] => 2
   etc...
)