add.php

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<?php
$label = get_input('label');
$type = get_input('type');

$fieldlist = elgg_get_config('profile_custom_fields');
if (!$fieldlist && $fieldlist !== '0') {
    $fieldlist = '';
    $id = 0;
} else {
    $fieldlistarray = explode(',', $fieldlist);
    foreach ($fieldlistarray as $key => $value) {
        $fieldlistarray[$key] = (int)$value;
    }
    $id = max($fieldlistarray) + 1;
}

if (($label) && ($type)) {
    if ($fieldlist !== '') {
        $fieldlist .= ',';
    }
    $fieldlist .= "$id";

    if (elgg_save_config("admin_defined_profile_$id", $label) &&
        elgg_save_config("admin_defined_profile_type_$id", $type) &&
        elgg_save_config('profile_custom_fields', $fieldlist)) {

        system_message(elgg_echo('profile:editdefault:success'));
    } else {
        register_error(elgg_echo('profile:editdefault:fail'));
    }
} else {
    register_error(elgg_echo('profile:editdefault:fail'));
}

forward(REFERER);