<?php

use MongoDB\Driver\Query;
use MongoDB\Driver\ReadPreference;

ini_set('mongodb.debug', '/var/tmp');

$manager = new MongoDB\Driver\Manager('mongodb://localhost:27100/?replicaSet=replset&compressors=snappy&tls=false&socketTimeoutMS=2&connectTimeoutMS=2&serverSelectionTimeoutMS=2&heartbeatFrequencyMS=500');
$readPreference = new ReadPreference(ReadPreference::RP_SECONDARY, null, ['maxStalenessSeconds' => 90]);
$query = new Query(['k' => 'v']);

while (true) {
    try {
        $doc = $manager->executeQuery('delay.coll', $query, ['readPreference' => $readPreference]);
    } catch (\Exception $e) {
        if ($e->getMessage() === 'Not all servers support maxStalenessSeconds') {
            echo "got it!\n";
            sleep(86400);
        }
    }
}

n734:mongodb-driver $ lldb php
(lldb) target create "php"
Current executable set to 'php' (x86_64).
(lldb) b mongoc-topology.c:655
Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) r delay.php
Process 94260 launched: '/usr/local/bin/php' (x86_64)
1 location added to breakpoint 1

mongodb.so was compiled with optimization - stepping may behave oddly; variables may not be available.
Process 94260 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000105a5b7c5 mongodb.so`mongoc_topology_compatible(td=0x0000000105032000, read_prefs=<unavailable>, error=0x00007ffeefbfe390) at mongoc-topology.c:655:10 [opt]
   652           mongoc_topology_description_lowest_max_wire_version (td);
   653  
   654        if (max_wire_version < WIRE_VERSION_MAX_STALENESS) {
-> 655           bson_set_error (error,
   656                           MONGOC_ERROR_COMMAND,
   657                           MONGOC_ERROR_PROTOCOL_BAD_WIRE_VERSION,
   658                           "Not all servers support maxStalenessSeconds");
Target 0: (php) stopped.
(lldb) bt all
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
  * frame #0: 0x0000000105a5b7c5 mongodb.so`mongoc_topology_compatible(td=0x0000000105032000, read_prefs=<unavailable>, error=0x00007ffeefbfe390) at mongoc-topology.c:655:10 [opt]
    frame #1: 0x0000000105a5ba52 mongodb.so`mongoc_topology_select_server_id(topology=0x0000000105032000, optype=MONGOC_SS_READ, read_prefs=0x0000000103cd95d0, error=0x00007ffeefbfe390) at mongoc-topology.c:859:15 [opt]
    frame #2: 0x0000000105a5b826 mongodb.so`mongoc_topology_select(topology=0x0000000105032000, optype=<unavailable>, read_prefs=<unavailable>, error=0x00007ffeefbfe390) at mongoc-topology.c:737:7 [opt]
    frame #3: 0x0000000105a22549 mongodb.so`mongoc_client_select_server(client=0x0000000103cdae00, for_writes=false, prefs=0x0000000103cd95d0, error=0x00007ffeefbfe390) at mongoc-client.c:2758:9 [opt]
    frame #4: 0x0000000105a92c9f mongodb.so`php_phongo_manager_select_server(for_writes=false, zreadPreference=0x000000010585fa40, zsession=<unavailable>, client=0x0000000103cdae00, server_id=0x00007ffeefbfe60c) at Manager.c:295:20 [opt]
    frame #5: 0x0000000105a925c6 mongodb.so`zim_Manager_executeQuery(execute_data=<unavailable>, return_value=0x0000000105817170) at Manager.c:573:7 [opt]
    frame #6: 0x0000000103dd51b1 xdebug.so`xdebug_execute_internal + 465
    frame #7: 0x00000001003d748a php`ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER + 380
    frame #8: 0x00000001003bbafb php`execute_ex + 35
    frame #9: 0x0000000103dd4f54 xdebug.so`xdebug_execute_ex + 1044
    frame #10: 0x00000001003bbcb3 php`zend_execute + 352
    frame #11: 0x000000010037eb66 php`zend_execute_scripts + 277
    frame #12: 0x00000001003272e5 php`php_execute_script + 482
    frame #13: 0x000000010040543e php`do_cli + 3833
    frame #14: 0x00000001004043a3 php`main + 1211
    frame #15: 0x00007fff68bfbcc9 libdyld.dylib`start + 1
(lldb) fr v
(const mongoc_topology_description_t *) td = 0x0000000105032000
(const mongoc_read_prefs_t *) read_prefs = <variable not available>

(bson_error_t *) error = 0x00007ffeefbfe390
(int64_t) max_staleness_seconds = 90
(int32_t) max_wire_version = 0