PHP gets Memcached's cas_token

php official method code

$ips = $m->get('ip_block', null, $cas);

According to the code provided by php official documentation to obtain cas_token, the result $cas is always null, after checking for a long time, it turns out that it is obtained in php5 and php7 The method of cas_token is different

php5 method

$ips = $m->get('ip_block', null, $cas);
var_dump($cas);

php7 method

$_val = $m->get('ip_block', null, Memcached::GET_EXTENDED);
var_dump($_val['cas']);

make a judgment

$cas = null;
if (defined(Memcached::GET_EXTENDED)){
    $_val = $m->get('ip_block', null, Memcached::GET_EXTENDED);
    $cas = $_val['cas'];
} else {
    $ips = $m->get('ip_block', null, $cas);
}
var_dump($cas);

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