add item in array which loops in foreach loop

Question

So I have a foreach loop which loops though an array of items. The checkIfSubCategorie() returns an array with new items.

I want to place all these items in the $subcategorien array. This works good. The problem is that those items don't go through the initial foreach loop. Is this possible and if yes, how?

foreach($subcategorien as $subcat) {

    //make array with all subcategorien
    $newarray = self::checkIfSubCategorie($subcat);

    if(is_array($newarray)) {
        foreach($newarray as $a) {

            // add item to subcategorien
            array_push($subcategorien, $a);
        }
    }
}

This is the $subcategorien array before the initial foreach loop:

array(2) {
  [0]=> string(3) "701"
  [1]=> string(3) "702"
}

var_dump of $newarray:

array(1) {
  [0]=> string(1) "8"
}
bool(false)

This is the $subcategorien array after the foreach loop:

array(3) {
  [0]=> string(3) "701"
  [1]=> string(3) "702"
  [2]=> string(1) "8"
}

The result should be:

array(3) {
  [0]=> string(3) "701"
  [1]=> string(3) "702"
  [2]=> string(1) "8"
  [3]=> string(1) "9"
}

can you var_dump the value of $newarray in the first loop, before line4? — bIgBoY
– bIgBoY, Commented Dec 16, 2015 at 9:34
So, just to be sure I understand, you want the new values added to $subcategorien to be lopped in the first foreach? — Epodax
– Epodax, Commented Dec 16, 2015 at 9:35

Mihai Matei · Accepted Answer · 2015-12-16 09:58:08Z

1

What you are looking for is called recursive function. Something like:

function getCategoryChildren($categoryParentId, $categories = array()) {
    // TODO: query to get all the categories by their parents id
    while ($row = $stmt->fetch_assoc()) {
         $categories[] = $row['category_id'];
         $categories = getCategoryChildren($row['category_id'], $categories);
    }
    return $categories;
}

$allCategories = getCategoryChildren(0);

answered Dec 16, 2015 at 9:58

Mihai Matei

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Comments

rahul · Accepted Answer · 2015-12-16 10:02:29Z

0

Try this it similar to your code:

 $result_array = array();
 foreach($subcategorien as $subcat){
    //make array with all subcategorien
    $newarray = checkIfSubCategorie($subcat);
    $result_array[] = $subcat;
    if(is_array($newarray)){
        foreach($newarray as $a){
         $result_array[] = $a;
        }
    }
 }

answered Dec 16, 2015 at 10:02

rahul

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Comments

miguelbgouveia · Accepted Answer · 2015-12-16 10:05:35Z

0

From PHP Manuals array_push() will raise a warning if the first argument is not an array. This differs from the $var[] behavior where a new array is created.

If you use array_push() to add one element to the array it's better to use $array[] = because in that way there is no overhead of calling a function.

edited Dec 16, 2015 at 10:05

miguelbgouveia

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answered Dec 16, 2015 at 9:56

Waqas Shahzad

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