Question

How to make this backwards compatible with PHP5.2? It works on 5.3 and later

error

Fatal error: Cannot call method self::utf8_dec() or method does not exist

code

private function utf8_decode($arr){
    array_walk_recursive($arr, 'self::utf8_dec'); // <----- error

    return $arr;
}

private function utf8_dec(&$value, $key){
    $value = utf8_decode($value);
}

Answer 1

Instead of self, you can use the name of the class directly. It’s not as flexible but it should work.

static private function utf8_decode($arr){
    array_walk_recursive($arr, 'YourClass::utf8_dec');

    return $arr;
}

static private function utf8_dec(&$value, $key){
    $value = utf8_decode($value);
}

Also you need to prefix the methods with the static keyword.