spanner/src/admin/archived/enable_fine_grained_access.php [49:83]:
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function enable_fine_grained_access(
    string $projectId,
    string $instanceId,
    string $databaseId,
    string $iamMember,
    string $databaseRole,
    string $title
): void {
    $adminClient = new DatabaseAdminClient();
    $resource = $adminClient->databaseName($projectId, $instanceId, $databaseId);
    $getIamPolicyRequest = (new GetIamPolicyRequest())
        ->setResource($resource);
    $policy = $adminClient->getIamPolicy($getIamPolicyRequest);

    // IAM conditions need at least version 3
    if ($policy->getVersion() != 3) {
        $policy->setVersion(3);
    }

    $binding = new Binding([
        'role' => 'roles/spanner.fineGrainedAccessUser',
        'members' => [$iamMember],
        'condition' => new Expr([
            'title' => $title,
            'expression' => sprintf("resource.name.endsWith('/databaseRoles/%s')", $databaseRole)
        ])
    ]);
    $policy->setBindings([$binding]);
    $setIamPolicyRequest = (new SetIamPolicyRequest())
        ->setResource($resource)
        ->setPolicy($policy);
    $adminClient->setIamPolicy($setIamPolicyRequest);

    printf('Enabled fine-grained access in IAM' . PHP_EOL);
}
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spanner/src/enable_fine_grained_access.php [49:83]:
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function enable_fine_grained_access(
    string $projectId,
    string $instanceId,
    string $databaseId,
    string $iamMember,
    string $databaseRole,
    string $title
): void {
    $adminClient = new DatabaseAdminClient();
    $resource = $adminClient->databaseName($projectId, $instanceId, $databaseId);
    $getIamPolicyRequest = (new GetIamPolicyRequest())
        ->setResource($resource);
    $policy = $adminClient->getIamPolicy($getIamPolicyRequest);

    // IAM conditions need at least version 3
    if ($policy->getVersion() != 3) {
        $policy->setVersion(3);
    }

    $binding = new Binding([
        'role' => 'roles/spanner.fineGrainedAccessUser',
        'members' => [$iamMember],
        'condition' => new Expr([
            'title' => $title,
            'expression' => sprintf("resource.name.endsWith('/databaseRoles/%s')", $databaseRole)
        ])
    ]);
    $policy->setBindings([$binding]);
    $setIamPolicyRequest = (new SetIamPolicyRequest())
        ->setResource($resource)
        ->setPolicy($policy);
    $adminClient->setIamPolicy($setIamPolicyRequest);

    printf('Enabled fine-grained access in IAM' . PHP_EOL);
}
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