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failed to fetch logged in user data

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i 've got  difficulty fetching currently logged in user data for display and further editing

here is my code from (users.php) or what most refer to "functions.php

function user_data($user_id) {
    $data = array();
    $user_id = (int)$user_id;
    $func_num_args = func_num_args();
    $func_get_args = func_get_args();
    if ($func_num_args > 1){
        $fields = '`' . implode('`, `', $func_get_args) . '`';
        $data = mysql_fetch_assoc(mysql_query("SELECT $fields FROM `log_in_registrar` WHERE `user_id` = $user_id"));
        return $data;

i hope it makes some sense


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What's the actual problem you're having? What errors are you seeing, if any? 

All that being said, there's kind of a lot of problems with that code from a design standpoint. Way too much undocumented magic going on. The dynamic fetching of specific fields is dubious.  

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