(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ldap_get_option — Get the current value for given option
   Sets retval to the value of the specified option.
  
link_identifierAn LDAP link identifier, returned by ldap_connect().
option
       The parameter option can be one of:
       
| Option | Type | since | 
|---|---|---|
LDAP_OPT_DEREF | 
           integer | |
LDAP_OPT_SIZELIMIT | 
           integer | |
LDAP_OPT_TIMELIMIT | 
           integer | |
LDAP_OPT_NETWORK_TIMEOUT | 
           integer | |
LDAP_OPT_PROTOCOL_VERSION | 
           integer | |
LDAP_OPT_ERROR_NUMBER | 
           integer | |
LDAP_OPT_REFERRALS | 
           bool | |
LDAP_OPT_RESTART | 
           bool | |
LDAP_OPT_HOST_NAME | 
           string | |
LDAP_OPT_ERROR_STRING | 
           string | |
LDAP_OPT_MATCHED_DN | 
           string | |
LDAP_OPT_SERVER_CONTROLS | 
           array | |
LDAP_OPT_CLIENT_CONTROLS | 
           array | |
LDAP_OPT_X_KEEPALIVE_IDLE | 
           int | 7.1 | 
LDAP_OPT_X_KEEPALIVE_PROBES | 
           int | 7.1 | 
LDAP_OPT_X_KEEPALIVE_INTERVAL | 
           int | 7.1 | 
LDAP_OPT_X_TLS_CACERTDIR | 
           string | 7.1 | 
LDAP_OPT_X_TLS_CACERTFILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_CERTFILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_CIPHER_SUITE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_CRLCHECK | 
           integer | 7.1 | 
LDAP_OPT_X_TLS_CRL_NONE | 
           integer | 7.1 | 
LDAP_OPT_X_TLS_CRL_PEER | 
           integer | 7.1 | 
LDAP_OPT_X_TLS_CRL_ALL | 
           integer | 7.1 | 
LDAP_OPT_X_TLS_CRLFILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_DHFILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_KEYILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_PACKAGE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_PROTOCOL_MIN | 
           integer | 7.1 | 
LDAP_OPT_X_TLS_RANDOM_FILE | 
           string | 7.1 | 
LDAP_OPT_X_TLS_REQUIRE_CERT | 
           integer | 
retvalThis will be set to the option value.
   Returns TRUE on success or FALSE on failure.
  
Example #1 Check protocol version
<?php
// $ds is a valid link identifier for a directory server
if (ldap_get_option($ds, LDAP_OPT_PROTOCOL_VERSION, $version)) {
    echo "Using protocol version $version\n";
} else {
    echo "Unable to determine protocol version\n";
}
?>
Note:
This function is only available when using OpenLDAP 2.x.x OR Netscape Directory SDK x.x.