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<?php
$array = array(5,5,10,20,30,40,50,64,7,10);
$a = array_fill(0, 9, 0);
foreach ($array as $number) 
  $a[(int)($number/10)]++;
print_r($a);

Success #stdin #stdout 0.02s 24324KB

stdin

Standard input is empty

stdout

Array
(
    [0] => 3
    [1] => 2
    [2] => 1
    [3] => 1
    [4] => 1
    [5] => 1
    [6] => 1
    [7] => 0
    [8] => 0
)

https://ideone.com/EuUQbS

language:

PHP (php 7.3.5)

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public

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