diff --git a/commands/root.go b/commands/root.go
index 0db2a8240..ab609a4f8 100644
--- a/commands/root.go
+++ b/commands/root.go
@@ -60,7 +60,7 @@ func newRootCommand(cnf *config.Config, assets *vendorization.VendorAssets) *cob
 				// Completions must be fast and quiet.
 				return
 			}
-			quiet := viper.GetBool("quiet") && !viper.GetBool("debug") && !viper.GetBool("verbose")
+			quiet := isQuiet()
 			if quiet {
 				viper.Set("no-interaction", true)
 				cmd.SetErr(io.Discard)
@@ -294,6 +294,11 @@ func debugLogf(format string, v ...any) {
 	fmt.Fprintf(color.Error, prefix+" "+strings.TrimSpace(format)+"\n", v...)
 }
 
+// isQuiet reports whether quiet mode is on, which --debug and --verbose override.
+func isQuiet() bool {
+	return viper.GetBool("quiet") && !viper.GetBool("debug") && !viper.GetBool("verbose")
+}
+
 func exitWithError(err error) {
 	var execErr *exec.ExitError
 	if errors.As(err, &execErr) {
@@ -301,7 +306,7 @@ func exitWithError(err error) {
 		debugLogf(err.Error())
 		os.Exit(exitCode)
 	}
-	if !viper.GetBool("quiet") {
+	if !isQuiet() {
 		fmt.Fprintln(color.Error, color.RedString(err.Error()))
 	}
 	os.Exit(1)
diff --git a/integration-tests/quiet_errors_test.go b/integration-tests/quiet_errors_test.go
new file mode 100644
index 000000000..679e9a4f3
--- /dev/null
+++ b/integration-tests/quiet_errors_test.go
@@ -0,0 +1,38 @@
+package tests
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestQuietErrors checks that --verbose and --debug override --quiet for errors before the legacy CLI runs.
+func TestQuietErrors(t *testing.T) {
+	f := newCommandFactory(t, "", "")
+	// A file in place of the temporary directory makes the legacy CLI fail to start.
+	tmpFile := filepath.Join(t.TempDir(), "file")
+	require.NoError(t, os.WriteFile(tmpFile, nil, 0o600))
+	f.extraEnv = append(f.extraEnv, EnvPrefix+"TMP="+tmpFile)
+
+	cases := []struct {
+		args      []string
+		wantError bool
+	}{
+		{[]string{"-q"}, false},
+		{[]string{"-qv"}, true},
+		{[]string{"-q", "--debug"}, true},
+		{nil, true},
+	}
+	for _, c := range cases {
+		_, stderr, err := f.RunCombinedOutput(append([]string{"project:list"}, c.args...)...)
+		assertExitCode(t, 1, err)
+		if c.wantError {
+			assert.Contains(t, stderr, "failed to initialize PHP CLI", "args: %v", c.args)
+		} else {
+			assert.Empty(t, stderr, "args: %v", c.args)
+		}
+	}
+}
diff --git a/integration-tests/tests.go b/integration-tests/tests.go
index 3db1ccb12..208f7c075 100644
--- a/integration-tests/tests.go
+++ b/integration-tests/tests.go
@@ -192,7 +192,10 @@ func (f *cmdFactory) fakeBrowser() {
 		f.t.Skip("the fake browser is a shell script")
 	}
 	dir := f.t.TempDir()
-	require.NoError(f.t, os.WriteFile(filepath.Join(dir, "xdg-open"), []byte("#!/bin/sh\nexit 0\n"), 0o755))
+	// The CLI uses "open" on macOS, and "xdg-open" on Linux.
+	for _, name := range []string{"open", "xdg-open"} {
+		require.NoError(f.t, os.WriteFile(filepath.Join(dir, name), []byte("#!/bin/sh\nexit 0\n"), 0o755))
+	}
 	f.extraEnv = append(f.extraEnv, "DISPLAY=:0", "PATH="+dir+string(os.PathListSeparator)+os.Getenv("PATH"))
 }