I can not find an error in php (It all starts here: http://stackoverflow.com/questions/30393024/)

Question

I can not find an error in php. Sometimes such a error:

Warning: array_walk() expects parameter 2 to be a valid callback, function \'array_sanitize\'

Answer 1

Try this:

function register_user($register_data) {
    global $con;
    array_walk($register_data, 'array_sanitize');
    $register_data['password'] = md5($register_data['password']);

    $fields = '`' . implode('`, `', array_keys($register_data)) . '`';
    $data = '\'' . implode('\', \'', $register_data) . '\'';

    $insert = "INSERT INTO users($fields) VALUES ($data) ";
    mysqli_query($con,$insert);
    $last_id = mysqli_insert_id($con);
    $update = "UPDATE users SET url = '".$last_id."' WHERE id = ".$last_id." ";
    mysqli_query($con,$update );  
}
function aray_sanitize(&$item) { 
    $item = mysql_real_escape_string($item); 
}