Are there any specific PHP functions or methods that should be used to check for LDAP server reachability?

To check for LDAP server reachability in PHP, you can use the `ldap_connect()` function to establish a connection to the LDAP server. You can then use the `ldap_bind()` function to bind to the server with a specified username and password. If the connection and binding are successful, it indicates that the LDAP server is reachable. 

// LDAP server details
$ldapServer = 'ldap://ldap.example.com';
$ldapPort = 389;

// Attempt to connect to the LDAP server
$ldapConn = ldap_connect($ldapServer, $ldapPort);

if ($ldapConn) {
    // Bind to the LDAP server with a username and password
    $ldapBind = ldap_bind($ldapConn, 'username', 'password');

    if ($ldapBind) {
        echo 'LDAP server is reachable.';
    } else {
        echo 'Failed to bind to the LDAP server.';
    }

    // Close the LDAP connection
    ldap_close($ldapConn);
} else {
    echo 'Failed to connect to the LDAP server.';
}

Keywords

PHP LDAP server reachability functions methods

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