计算多个PHP数组的出现次数[重复]

Question

This question already has an answer here:

• Count specific values in multidimensional array 3 answers

I'm looking for a way to count occurence on an array of array.

This is my array :

Array
(
[0] => Array
    (
        [id] => 671
        [title] => BIEND
        [img] => 
        [ville] => marseille
    )

[1] => Array
    (
        [id] => 670
        [title] => BIENC
        [img] => 
        [ville] => avignon
    )

[2] => Array
    (
        [id] => 669
        [title] => BIENB
        [img] => 
        [ville] => avignon
    )

)

And what I would like to have :

Array
(
[avignon] => 2
[marseille] => 1
)

I tried with array_count_values, but it dont seems to be the good way.

Any idea?

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Answer 1

You could just go through it manually:

$result = array();
foreach($input as $item) 
{
  $result[$item['ville']]++;
}

or, slightly nicer perhaps,

$result = array();
foreach($input as $item) 
{ 
  $city = $item['ville'];
  if(!array_key_exists($city, $result)) {
    $result[$city] = 1;
  } else {
    $result[$city]++;
  }
}

Alternatively, you could do some array_map magic to first get an array with all the cities, and then use array_count_values as you planned:

$cities = array_count_values( array_map( function($a) { return $a['ville']; } ) );

Note, I haven't tested this last solution, I personally think the first one expresses the intention better. If you would like to use this one because it is shorter (i.e. less readable) I'll leave it to you to debug and comment it