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@ 2020-04-10T13:36:13Z

<?php 
$array = array(6,8,9,8,9,8,5,4,4,9);
function Counting($array){ 
    $freq_data = array_count_values($array);
    $unique_elements = array_map('intval',array_keys($freq_data));
    
    $min_element = min($unique_elements);
    $max_element = max($unique_elements);
    
    $percentage_data = [];
    $total = count($array);
    
    for($i = $min_element; $i <= $max_element ; ++$i){
        $current_percentage = isset($freq_data[$i]) ? ($freq_data[$i] / $total) : 0;
        $percentage_data[$i] = $i > $min_element ?  $percentage_data[$i-1] +  $current_percentage : $current_percentage;
    }
    
    uksort($percentage_data,function($a,$b){
        return strnatcmp($a,$b);
    });// just to be sure that associative hash keys are in ascending order
    
    return $percentage_data;
} 

print_r(Counting($array));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [4] => 0.2 [5] => 0.3 [6] => 0.4 [7] => 0.4 [8] => 0.7 [9] => 1 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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