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  1. <?php
  2. 	$a = array(array('B' => '1'), array('B'=>'1'), array('B' => '1'), array("C"=>"1"), array('C'=>'1'));
  3.     print_r($a);
  4.     print_r(array_count_values(array_map('key', $a)));
  5. ?>
Success #stdin #stdout 0.02s 13112KB
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Array
(
    [0] => Array
        (
            [B] => 1
        )

    [1] => Array
        (
            [B] => 1
        )

    [2] => Array
        (
            [B] => 1
        )

    [3] => Array
        (
            [C] => 1
        )

    [4] => Array
        (
            [C] => 1
        )

)
Array
(
    [B] => 3
    [C] => 2
)
https://ideone.com/wAnHos
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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