active directory - PHP ldap_connect to multiple hosts in case of one beeing not reachable -

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a co-worker suggested use multiple hosts website authentication
based on ldap in case 1 host down. know can 

$ldap_servers = "10.101.01.1 10.100.10.2"; $ldap = ldap_connect($ldap_servers);

but i'm using config file:

return [     'domain_controller' => ['10.101.01.1', '10.100.10.2'],     'base_dn'           => 'ou=foo,dc=example,dc=local',     'ssl'               => false,     ... ];

whereas connection done via

$protocol = $this->ssl ? $this::protocol_ssl : $this::protocol; $port     = $this->ssl ? $this::port_ssl : $this::port;  return $this->connection = ldap_connect($protocol . $hostname, $port);

as co-worker suggested might possible our ldap hosts run via ssl in future, how can make multiple hosts work this? above it's working hostname only, that's because it's non-ssl based. given ssl need ldaps:// protocol , portnumber, right? therefore not work hostname , i'm not sure if can simple connection looks like
ldap_connect('ldaps://' . '10.101.01.1 10.100.10.2', 123);
(supposed both servers run same port ssl based ldap)

edit: got working using ldap_connect('ldaps://hostnameone ldaps://hostnametwo, 636'); reddit user said: "notice still separated spaces, , should tried in order of appearance.."

you should able this:

ldap_connect("ldaps://example.com:389 ldap://example.com:389")

but beware: on starting connection (which not on calling ldap_connect) try first server , after timeout try next server , on. might cause unwanted delay!


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