请帮助我,我需要合并多个数组,然后按数组值计数排序.以下是问题：
$array1 = array("abc","def","ghi","jkl","mno");
$array2 = array("mno","mno","pqr","stu");
$array3 = array_merge($array1,$array2);
$array4 = ???
print_r($array4);
我想要$array4的返回值如下：
Array ( [0] => mno [1] => ghi [2] => jkl [3] => abc [4] => def [5] => pqr [6] => stu )
你可以做：
$array1 = array("abc",$array2);
// get the array of count.
$array4 = array_count_values($array3);
// sort it in reverse order.
arsort($array4);
// extract just the keys.
$array4 = array_keys($array4);
Working example