[FIXED] Counts occurrences in multidimensional array

Issue

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Solution

This happens because your array $arr contains a string (apple) and arrays:

$arr = [
  "apple",
  ["banana", "strawberry", "apple"],
  ["banana", "strawberry", "apple", ["banana", "strawberry", "apple"]]
];

$count = 0;

foreach ($arr as $arritem) {
    // first iteration: $arritem is "apple"
    // second iteration: $arritem is ["banana", ...]
    // third iteration: $arritem is ["banana", ...]
    if ($arritem === "apple") {
        $count++;
    }
}

echo $count;

$arritem === "apple" only holds true for one element in the array, hence the output 1.

How to fix ? Use array_walk_recursive to recursively walk the array(s):

$count = 0;

array_walk_recursive($arr, function($item) use (&$count) {
    if ($item === "apple") ++$count;
});

echo $count; // outputs 4

Answered By - marco-a