Summary

The ext-mongodb driver currently requires the compressors URI option to be a comma-separated string:

new MongoDB\Driver\Manager\('mongodb://localhost/', [
    'compressors' => 'snappy,zstd,zlib',
]);

Passing a PHP array throws:

InvalidArgumentException: Expected string for "compressors" URI option, array given

Proposal

Accept an array of strings in addition to the CSV string form:

new MongoDB\Driver\Manager\('mongodb://localhost/', [
    'compressors' => ['snappy', 'zstd', 'zlib'],
]);

Rationale* More idiomatic in PHP and in framework configuration files (e.g. Laravel config/database.php).

• Avoids CSV pitfalls: stray spaces, typos, manual implode() calls.
• Consistent with how other list-like options are typically expressed in PHP userland.
• The CSV string form should remain supported for backward compatibility and parity with the connection string.

Scope

URI option parsing in ext-mongodb. Documentation and library examples can be updated once available.