Recursion with multidimensional array?

Question

I have array like this:

$array = [
 'Category 1',
 'Category 2',
 [
 [
 'SubCategory 1',
 'SubCategory 2'
 ],
 [
 'SubCategory 3',
 'SubCategory 4',
 [
 [
 'SubSubCategory 1',
 'SubSubCategory 2'
 ]
 ]
 ],
 [
 'SubCategory 4',
 'SubCategory 5',
 [
 [
 'SubSubCategory 3',
 'SubSubCategory 4'
 ]
 ]
 ]
 ]
];

And i try do recursion:

function recursive($array)
{
 foreach($array as $key => $val) {
 if(is_array($val)) {
 recursive($val);
 }
 echo $val;
 }
}

It throws an notice "Notice: Array to string conversion" because

 [2] => array(
 [0] => array(..)
 [1] => array(..)
 ..
 );

And also echo Array

In this case, when the array has such a layout. How can I avoid that notice?

• ADyson: it would help if you could tell us the purpose of your recursive function and your desired output.
• ADyson: 'category 2' => array(...this is not true in your code above. "Category 2" in your array is a simple string at index 1 of the array. Then index 2 is an array, separately. Are you trying to create an associative array?
• user9076455: I corrected, thanks

Answer 1

You only want to echo the value if it is not an array, so just add an else.

function recursive($array)
{
 foreach($array as $key => $val) {
 if(is_array($val)) {
 recursive($val);
 } else {
 echo $val;
 }
 }
}