Get arrays data by keys using recursive function

Question

Function getting an array(s) to loop though to get all child categories of selected category. Array look something like:

Array ( 
    [0] => Array ( 
        [id] => 7 
        [title] => Deserts 
        [slug] => deserts 
        [child] => Array ( 
            [0] => Array ( 
                [id] => 8 
                [title] => Space 
                [slug] => space 
                [child] => Array ( 
                    [0] => Array ( 
                        [id] => 
                        [title] => 
                        [slug] => 
                        [child] => Array ( ) 
                    ) 
                ) 
            ) 
        ) 
    ) 
)

I come up with a code to display all the values with foreach() loop, but I can't make things work when I need data from an exact key, for example $category['id']

public static function recursiveChildCategory($categories = [], $depth = 0) {

        // Loop through categories
        foreach($categories as $category){

        // If $category is an array.
        if(is_array($category)){

            // Drop empty arrays
            $filteredCategory = array_filter($category);

            // Loop
            self::recursiveChildCategory($filteredCategory, $depth + 1);
        } else {
            //It is not an array, so print it out
       echo str_repeat("&nbsp;&nbsp;", $depth), $category, '<br>';

        }
    }
}

currently variable $category just prints outs all values. I want to get all info separately, like $category['id'], $category['title'] and etc.

Thanks in advice

so what's the problem? use $category['id'] instead of $category — Mihai Matei
– Mihai Matei, Commented Jun 25, 2019 at 7:59
@MateiMihai I think that wont help, $category could already be the id or title etc. — J. Knabenschuh
– J. Knabenschuh, Commented Jun 25, 2019 at 8:14

J. Knabenschuh · Accepted Answer · 2019-06-25 09:59:18Z

1

Just test of the fieldname value, see

    public static function recursiveChildCategory($categories = [], $depth = 0) {
            // Loop through categories
            foreach($categories as $category){

            // If $category is an array.
            if(is_array($category)){

                // Drop empty arrays
                $filteredCategory = array_filter($category);

                // Loop
                self::recursiveChildCategory($filteredCategory, $depth + 1);
            } else {
                //It is not an array, so print it out
                if($fieldOrIndex === 'id') {
                   echo str_repeat("&nbsp;&nbsp;", $depth), $category, '<br>';
                }
            }
        }
    }

To get separated tree prints for every field in category I think you have to call the function for every field. Replacing the "id"-string with function arg and call it with "id", "title" etc.

EDIT: to have all category data for e.g. creating a link:

public static function recursiveChildCategory($categories = [], $depth = 0) {
    // Loop through categories
    foreach($categories as $category){
        echo str_repeat("&nbsp;&nbsp;", $depth);
        echo "<a href='foo_bar_{$category['id']}'>{$category['title']}</a>";
        echo '<br>';

        if(isset($category['child'])){
            // Loop
            self::recursiveChildCategory($category['child'], $depth + 1);
        } 
    }
}

edited Jun 25, 2019 at 9:59

answered Jun 25, 2019 at 8:11

J. Knabenschuh

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9 Comments

RedEclipse Over a year ago

Thanks for your input it indeed works, but how I could wrap it into markup, to echo a link to category for example?

J. Knabenschuh Over a year ago

just add an html link echo str_repeat("  ", $depth), "<a href='{$URL}'>{$category}</a>", '<br>'; of course you need to create the link url.

RedEclipse Over a year ago

The thing is, I need separate key values just as I described to generate link to child category, so its vital here

J. Knabenschuh Over a year ago

so you need all data of a category to generate the link?

J. Knabenschuh Over a year ago

I updated my post adding a version providing all category data. Please see if it works for you

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