How to count elements inside array/object on PHP?

Question

I have this array being sent to my view

Array
(
    [0] => stdClass Object
        (
            [emg_id] => 2
            [fkit] => 1
            [door] => 
        )

)

I would like to count how many elements are empty, NULL, or '0'.

I tried using count but it always returns '1', instead of counting all of the elements, so I can later determine which satisfy my conditions above.

Any ideas what I'm doing wrong?

KingCrunch · Accepted Answer · 2011-07-21 14:20:26Z

4

// number of "null" elements
echo count(array_filter((array) $array[0], 'is_null'));

There are some other is_*()-functions built-in, that may help you for example to count the number of strings (and so on).

To test, if an element is (e.g.) 0, I suggest to use an anonymous function

echo count(array_filter((array) $array[0], function ($item) {
  return $item === 0;
}));

The other cases are similar.

edited Jul 21, 2011 at 14:20

answered Jul 21, 2011 at 13:51

KingCrunch

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4 Comments

pepe Over a year ago

thx @kingcrunch -- how about the 'is_null' in your first example: I get an error message saying the second parameter should be long, string given -- is your 'is_null' just a placeholder?

pepe Over a year ago

:) - good xkcd BTW - looks like 'empty' also returns an error -- "The second argument, 'empty', should be a valid callback"

KingCrunch Over a year ago

... empty is a language construct -.- However, the idea is clear? :D

pepe Over a year ago

yes thanks for helping -- looks like using array_filter without callback covers most of my needs

KingCrunch · Accepted Answer · 2011-07-21 14:04:18Z

1

loop through them and count.

function loopMe($array, $value) {
    $num = 0;
    foreach($array as $key=>$val) {
        if($val == $value)
        $num++;
    }
    return $num;
}


$ar = array (
    array (
        "emg_id" => 2
        "fkit" => 1
        "door" => null));
$num = loopMe($ar[0], null);

edited Jul 21, 2011 at 14:04

KingCrunch

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answered Jul 21, 2011 at 13:51

Senad Meškin

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