Add custom profile field to edit user profile

user_custom_profile_field.php

<?php
/**
 * Add user profile extra fields.
 *
 * @param object $user
 * @return void
 */
function buntywp_extra_user_profile_fields( $user ) {

	$extra_field = get_user_meta( $user->ID, 'extra_field', true );

	?>
	<h3><?php _e( 'Extra profile fields', 'default' ); ?></h3>

	<table class="form-table">
	  <tr>
		<th><label for="extra_field"><?php _e( 'Extra Field' ); ?></label></th>
		<td>
		  <input type="text" name="extra_field" id="extra_field" value="<?php echo esc_attr( $extra_field ); ?>" class="regular-text" /><br />
		  <p class="description"><?php _e( 'Description goes gere.', 'default' ); ?></p>
		</td>
	  </tr>
	</table>
	<?php
}

add_action( 'edit_user_profile', 'buntywp_extra_user_profile_fields', 99 );

/**
 * Save user profile extra fields.
 *
 * @param int $user_id
 * @return void
 */
function buntywp_save_extra_user_profile_fields( $user_id ) {

	if ( empty( $user_id ) ) {
		return;
	}

	// Verify the nonce.
	if ( empty( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], 'update-user_' . $user_id ) ) {
		return;
	}

	// Only allow admin.
	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}

	// Set company creator.
	update_user_meta( $user_id, 'extra_field', $_POST['extra_field'] );
}

add_action( 'edit_user_profile_update', 'buntywp_save_extra_user_profile_fields' );

Awesome code, bro! Thanks for sharing