<?php

$array  = array('25','26','26','10','24','10','26', '','');


echo "-------ORIGNAL ARRAY-------";
print_r($array);

// remove the blank values 
$array = array_filter($array);

$reqArray = array_count_values($array);



echo "-------Required ARRAY-------";
print_r($reqArray);



?>

-------ORIGNAL ARRAY-------Array
(
    [0] => 25
    [1] => 26
    [2] => 26
    [3] => 10
    [4] => 24
    [5] => 10
    [6] => 26
    [7] => 
    [8] => 
)
-------Required ARRAY-------Array
(
    [25] => 1
    [26] => 3
    [10] => 2
    [24] => 1
)