echo $wp_version;
а вот какая актуальная это совсем другое дело...var_dump(get_option('_site_transient_update_core'));
// get_site_transient('update_core');
object(stdClass)#4132 (4) { ["updates"]=> array(1) { [0]=> object(stdClass)#4131 (10) { ["response"]=> string(6) "latest" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4130 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["no_content"]=> string(0) "" ["new_bundled"]=> string(0) "" ["partial"]=> string(0) "" ["rollback"]=> string(0) "" } ["current"]=> string(5) "5.6.1" ["version"]=> string(5) "5.6.1" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" } } ["last_checked"]=> int(1613826409) ["version_checked"]=> string(5) "5.6.1" ["translations"]=> array(0) { } }
object(stdClass)#4003 (4) { ["updates"]=> array(9) { [0]=> object(stdClass)#4051 (10) { ["response"]=> string(7) "upgrade" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4048 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.6.1" ["version"]=> string(5) "5.6.1" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" } [1]=> object(stdClass)#4002 (10) { ["response"]=> string(7) "upgrade" ["download"]=> string(59) "https://downloads.wordpress.org/release/wordpress-5.6.1.zip" ["locale"]=> string(5) "en_US" ["packages"]=> object(stdClass)#4001 (5) { ["full"]=> string(59) "https://downloads.wordpress.org/release/wordpress-5.6.1.zip" ["no_content"]=> string(70) "https://downloads.wordpress.org/release/wordpress-5.6.1-no-content.zip" ["new_bundled"]=> string(71) "https://downloads.wordpress.org/release/wordpress-5.6.1-new-bundled.zip" ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.6.1" ["version"]=> string(5) "5.6.1" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" } [2]=> object(stdClass)#4061 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4054 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.1.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.6.1" ["version"]=> string(5) "5.6.1" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [3]=> object(stdClass)#4053 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(63) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4052 (5) { ["full"]=> string(63) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.6.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(3) "5.6" ["version"]=> string(3) "5.6" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [4]=> object(stdClass)#3984 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.5.3.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4004 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.5.3.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.5.3" ["version"]=> string(5) "5.5.3" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [5]=> object(stdClass)#4005 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.5.2.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4006 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.5.2.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.5.2" ["version"]=> string(5) "5.5.2" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [6]=> object(stdClass)#4007 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.4.4.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4008 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.4.4.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.4.4" ["version"]=> string(5) "5.4.4" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [7]=> object(stdClass)#4009 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.3.6.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4066 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.3.6.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.3.6" ["version"]=> string(5) "5.3.6" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } [8]=> object(stdClass)#4069 (11) { ["response"]=> string(10) "autoupdate" ["download"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.2.9.zip" ["locale"]=> string(5) "ru_RU" ["packages"]=> object(stdClass)#4070 (5) { ["full"]=> string(65) "https://downloads.wordpress.org/release/ru_RU/wordpress-5.2.9.zip" ["no_content"]=> bool(false) ["new_bundled"]=> bool(false) ["partial"]=> bool(false) ["rollback"]=> bool(false) } ["current"]=> string(5) "5.2.9" ["version"]=> string(5) "5.2.9" ["php_version"]=> string(6) "5.6.20" ["mysql_version"]=> string(3) "5.0" ["new_bundled"]=> string(3) "5.6" ["partial_version"]=> string(0) "" ["new_files"]=> string(1) "1" } } ["last_checked"]=> int(1613826187) ["version_checked"]=> string(5) "5.1.8" ["translations"]=> array(0) { } }
// $yourObject=get_site_transient('update_core');
$yourObject=get_option('_site_transient_update_core');
$array=(array)$yourObject;
$arrayTwo=(array)$array['updates'][0];
// echo($arrayTwo['response']);
echo $arrayTwo['response']=='upgrade'?'(_!_)':'(⌒‿⌒)';
это уведомление может быть не явным текстом