How to run array_filter recursively in a PHP array?

Question 1

Given the following array $mm

Array
(
    [147] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )    
    [158] => Array
        (
            [pts_m] => 
            [pts_mreg] => 
            [pts_cg] => 0
        )

    [159] => Array
        (
            [pts_m] => 
            [pts_mreg] => 1
            [pts_cg] => 1
        )

)

When I run count(array_filter($mm)) I get 3 as result since it is not recursive.

count(array_filter($mm), COUNT_RECURSIVE) also will not do because I actually need to run the array_filter recursively, and then count its result.

So my question is: how do I recursively run array_filter($mm) in this case? My expected result here would be 4.

Please note that I am not using any callback so I can exclude false, null and empty.

Question 2

Should work

$count = array_sum(array_map(function ($item) {
  return ((int) !is_null($item['pts_m'])
       + ((int) !is_null($item['pts_mreg'])
       + ((int) !is_null($item['pts_cg']);
}, $array);

or maybe

$count = array_sum(array_map(function ($item) {
  return array_sum(array_map('is_int', $item));
}, $array);

There are definitely many more possible solutions. If you want to use array_filter() (without callback) remember, that it treats 0 as false too and therefore it will remove any 0-value from the array.

If you are using PHP in a pre-5.3 version, I would use a foreach-loop

$count = 0;
foreach ($array as $item) {
  $count += ((int) !is_null($item['pts_m'])
          + ((int) !is_null($item['pts_mreg'])
          + ((int) !is_null($item['pts_cg']);
}

Update

Regarding the comment below:

Thx @kc I actually want the method to remove false, 0, empty etc

When this is really only, what you want, the solution is very simple too. But now I don't know, how to interpret

My expected result here would be 5.

Anyway, its short now :)

$result = array_map('array_filter', $array);
$count = array_map('count', $result);
$countSum = array_sum($count);

The resulting array looks like

Array
(
[147] => Array
    (
        [pts_mreg] => 1
        [pts_cg] => 1
    )    
[158] => Array
    (
    )

[159] => Array
    (
        [pts_mreg] => 1
        [pts_cg] => 1
    )

)

Question 3

You can do this by unserializing the data (using unserialize()) and then iterating through it:

$fonts = array();

$contents = file_get_contents('http://phat-reaction.com/googlefonts.php?format=php');
$arr = unserialize($contents);

foreach($arr as $font)
{
    $fonts[$font['css-name']] = $font['font-name'];
}

Depending on what you're using this for, it may be a good idea to cache the results so you're not fetching external data each time the script runs.

Question 4

header('content-type:text/plain');

$arr = array(
    'a' => array(
        'b' => array(
            'c' => 'hello',
        ),
    ),
    'd' => array(
        'e' => array(
            'f' => 'world',
        ),
    ),
);

//prime the stack using our format
$stack = array();
foreach ($arr as $k => &$v) {
    $stack[] = array(
        'keyPath' => array($k),
        'node' => &$v
    );
}

$lookup = array();

while ($stack) {
    $frame = array_pop($stack);
    $lookup[join('/', $frame['keyPath'])] = &$frame['node'];
    if (is_array($frame['node'])) {
        foreach ($frame['node'] as $key => &$node) {
            $keyPath = array_merge($frame['keyPath'], array($key));
            $stack[] = array(
                'keyPath' => $keyPath,
                'node' => &$node
            );
            $lookup[join('/', $keyPath)] = &$node;
        }
    }
}


var_dump($lookup);
// check functionality
$lookup['a'] = 0;
$lookup['d/e/f'] = 1;
var_dump($arr);

Alternatively you could have done stuff like this to get a reference /w array_pop functionality

end($stack);
$k = key($stack);
$v = &$stack[$k];
unset($stack[$k]);

That works because php arrays have elements ordered by key creation time. unset() deletes the key, and thus resets the creation time for that key.

Question 5

You have to use recursive function for this. hope this might help you

<?php
 $rs = unsetValues($arr);

 function unsetValues($a)
 {
    foreach($a as $k=>$v)
    {
       if(is_array($v))
       {
          $arr2[$k] = unsetValues($v);
       } else {
          if($v!="")
          $arr2[$k] = $v;
      }
  }
  return $arr2;
}
?>

Question 6

Your PHP should create an Array which itself contains a series of associative arrays. You should then pass that through json_encode and send it to the browser.

Run the code

http://codepad.org/ibD8kGWG

Code

<?php
//outer array
$responseCollection = Array();


//logic to ceate inner arrays:
for( $i = 1; $i < 5; $i++ )
{
  $responseCollection[] = Array(
    'label' => 'label ' . $i,
    'category' => 'category ' . $i
  );
}

//json encode it
$json = json_encode( $responseCollection );

echo $json;

How to run array_filter recursively in a PHP array?

Answers

Update

php,recursion,count,array-filter