How can I sort an array by number of occurrence of its values?

Question

I have the following array:

$name_arr = array(\'raj\',\'raj\',\'ganesh\',\'rahul\',\'ganesh\',\'mayur\',\'raj\',\'rahul\');

I want to sort

Answer 1

Output

Array (raj , raj , raj , rahul , rahul, mayur, ganesh, ganesh )