Get Array Keys in Dot Notation

Converts nested array keys into dot notation.

PHP Code Editor

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<?php
echo "<pre>";
function array_keys_dot($array, $prefix = '') {
    $keys = [];
    foreach ($array as $key => $value) {
        $dotKey = $prefix === '' ? $key : "$prefix.$key";
        if (is_array($value)) {
            $keys = array_merge($keys, array_keys_dot($value, $dotKey));
        } else {
            $keys[] = $dotKey;
        }
    }
    return $keys;
}
var_dump(array_keys_dot([
    1 => [
        2, 3
   ]    
]));
 
 
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