add custom WordPress user fields

custom_user_fields.php

<?php 
/**
 * ampinstant Project
 * @package ampinstant
 * User: dankerizer
 * Date: 18/03/2017 / 03.36
 */

function wpinstant_extra_profile_fields( $user ) { ?>

    <h3>Extra profile information</h3>

    <table class="form-table">
<?php
    $fields = array('twitter'=> 'https://twitter.com/username','facebook' => 'https://www.facebook.com/username','youtube'=> 'https://www.youtube.com/username','google-plus' => 'https://plus.google.com/+hadiedanker','whatsapp' => '+628522954555','github'=> 'https://github.com/username');
    foreach ($fields as $item=>$url){
        $desc = 'Please enter your '.ucwords($item).' URL';
        if($item == 'whatsapp'){
            $desc = 'Please enter your '.ucwords($item).' Number. must use <a target="_blank" href="https://en.wikipedia.org/wiki/List_of_country_calling_codes">country code</a> e.g +62 for Indonesia';
        }
        echo '<tr>';
        echo ' <th><label for="'.$item.'">'.ucwords($item).'</label></th>';
        echo '<td>';
        echo '<input type="text" name="'.$item.'" id="'.$item.'" value="'.esc_attr( get_the_author_meta( $item, $user->ID ) ).'" class="regular-text" placeholder="'.$url.'" /><br />';
        echo '<p class="description">'.$desc.'</p>';
        echo '</td>';
        echo '</tr>';
    }

    ?>

        <tr><td>Generate by AMPinstant</td></tr>
    </table>
<?php }

add_action( 'personal_options_update', 'my_save_extra_profile_fields' );
add_action( 'edit_user_profile_update', 'my_save_extra_profile_fields' );

function my_save_extra_profile_fields( $user_id ) {

    if ( !current_user_can( 'edit_user', $user_id ) )
        return false;


    /* Copy and paste this line for additional fields. Make sure to change 'twitter' to the field ID. */
    $fields = array('twitter'=> 'https://twitter.com/username','facebook' => 'https://www.facebook.com/username','youtube'=> 'https://www.youtube.com/username','google-plus' => 'https://plus.google.com/+hadiedanker','whatsapp' => '+628522954555','github'=> 'https://github.com/username');
    foreach ($fields as $item=>$url){
        update_usermeta( $user_id, $item, $_POST[$item] );
    }

}