main

<?php

// Exit if accessed directly

if ( ! defined( 'ABSPATH' ) ) exit;

​

/**

 * Run check if username exists

 * @uses action hooks: wp_ajax_nopriv_ultimatemember_check_username_exists, wp_ajax_ultimatemember_check_username_exists

 * @return boolean

 */

function ultimatemember_check_username_exists() {

    UM()->check_ajax_nonce();

​

    $username = isset( $_REQUEST['username'] ) ? $_REQUEST['username'] : '';

    $exists   = username_exists( $username );

​

    /**

     * UM hook

     *

     * @type filter

     * @title um_validate_username_exists

     * @description Change username exists validation

     * @input_vars

     * [{"var":"$exists","type":"bool","desc":"Exists?"},

     * {"var":"$username","type":"string","desc":"Username"}]

     * @change_log

     * ["Since: 2.0"]

     * @usage

     * <?php add_filter( 'um_validate_username_exists', 'function_name', 10, 2 ); ?>

     * @example

     * <?php

     * add_filter( 'um_validate_username_exists', 'my_validate_username_exists', 10, 2 );

     * function my_account_pre_updating_profile( $exists, $username ) {

     *     // your code here

     *     return $exists;

     * }

     * ?>

     */

    $exists = apply_filters( 'um_validate_username_exists', $exists, $username );

​

    if ( $exists ) {

        echo 1;

    } else {

        echo 0;

    }

​

    die();

}

add_action('wp_ajax_nopriv_ultimatemember_check_username_exists', 'ultimatemember_check_username_exists');

add_action('wp_ajax_ultimatemember_check_username_exists', 'ultimatemember_check_username_exists');