如何按出现次数的顺序列出数组的元素？

Question

I have an array like this.

$array = array(
'Element1', 
'Element2', 
'Element3', 
'Element1', 
'Element1', 
'Element4', 
'Element4', 
'Element2', 
'Element2', 
'Element2', 
'Element2', 
'Element4', 
'Element5', 
'Element5' );

I want an array like this as output.

$output = array('Element2' , 'Element1', 'Element4', 'Element5', 'Element3');

So, what i want is:

1. Remove all the elements from the array which repeat.
2. Order the output array in such manner that the element which occured most in the input array is on top.

Answer 1

Use array_count_values() and sort()