Recursive function for flattening arrays

/**
 * Flattens an array into a single dimension array
 * @param array $array Array to flatten
 * @param string $parent The parent indice
 * @param string $separator The separator used in between indices
 * @return array Flattened array
 */
function flatten($array, $parent = '', $separator = '.')
 $return_array = array();
 foreach($array as $key => $value) {
 if( is_array($value) ) {
 $return_array = array_merge($return_array, flatten($value, $parent.$separator.$key, $separator));
 } else {
 $return_array[$parent.$separator.$key] = $value;
 }
 }
 return $return_array;
}

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