Add extra information field in wordpress user profile without plugins!!

When a wordpress user see their profile here he see some information field such as: google, facebook etc. but some times we need more extra field to add here. then you can create many extra field without any kinds of plugins. for this copy below code:

add_action( 'show_user_profile', 'my_show_extra_profile_fields' );
add_action( 'edit_user_profile', 'my_show_extra_profile_fields' );

function my_show_extra_profile_fields( $user ) { ?>

    <h3>Extra profile information</h3>

    <table class="form-table">

        <tr>
            <th><label for="twitter">Twitter</label></th>

            <td>
                <input type="text" name="twitter" id="twitter" value="<?php echo esc_attr( get_the_author_meta( 'twitter', $user->ID ) ); ?>" class="regular-text" /><br />
                <span class="description">Please enter your Twitter username.</span>
            </td>
        </tr>

    </table>
<?php }

PROBLEM COPY CODE? TRY HERE!!
after copy this code paste in in your wordpress themes 'functions.php' file and save it. now you see the user profile is full with many extra field which is contains in this code. you can change, increase, decrease field from code.
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