diff --git a/pinc/CharSuites.inc b/pinc/CharSuites.inc
index 9e85639e7..ac6364501 100644
--- a/pinc/CharSuites.inc
+++ b/pinc/CharSuites.inc
@@ -147,7 +147,9 @@ class CharSuites
             return;
         }
 
-        $charsuite_files = glob($relPath."charsuite-*.inc");
+        if (($charsuite_files = glob($relPath."charsuite-*.inc")) === false) {
+            throw new RuntimeException(_("Failed to load CharSuites files."));
+        }
         foreach ($charsuite_files as $charsuite_file) {
             include($charsuite_file);
         }
diff --git a/pinc/Project.inc b/pinc/Project.inc
index ce82603e3..d844c8848 100644
--- a/pinc/Project.inc
+++ b/pinc/Project.inc
@@ -1316,7 +1316,12 @@ class Project
         $db_names = $this->get_page_names_from_db();
 
         chdir($this->dir);
-        $disk_names = glob("*.{png,jpg}", GLOB_BRACE);
+        if (($disk_names = glob("*.{png,jpg}", GLOB_BRACE)) === false) {
+            throw new RuntimeException(sprintf(
+                _("Failed to list page images for %s."),
+                $this->projectid
+            ));
+        }
         sort($disk_names);
         return array_intersect($db_names, $disk_names);
     }
@@ -1347,7 +1352,12 @@ class Project
         $page_image_names = $this->get_page_names_from_db();
 
         chdir($this->dir);
-        $existing_image_names = glob("*.{png,jpg}", GLOB_BRACE);
+        if (($existing_image_names = glob("*.{png,jpg}", GLOB_BRACE)) === false) {
+            throw new RuntimeException(sprintf(
+                _("Failed to list page images for %s."),
+                $this->projectid
+            ));
+        }
         sort($existing_image_names);
         return array_diff($existing_image_names, $page_image_names);
     }
diff --git a/pinc/archiving.inc b/pinc/archiving.inc
index c299cec7d..db28b541c 100644
--- a/pinc/archiving.inc
+++ b/pinc/archiving.inc
@@ -72,7 +72,13 @@ function archive_project(Project $project, bool $dry_run = false): void
             echo "    Move $project_dir to $new_dir.\n";
         } else {
             // Remove uncompressed versions of whole-project texts, leaving zips.
-            foreach (glob("$project_dir/projectID*.txt") as $filename) {
+            if (($filenames = glob("$project_dir/projectID*.txt")) === false) {
+                throw new RuntimeException(sprintf(
+                    _("Failed to list whole-project texts when archiving %s."),
+                    $projectid
+                ));
+            }
+            foreach ($filenames as $filename) {
                 if (!unlink($filename)) {
                     throw new RuntimeException(sprintf(_("Unable to delete %s"), $filename));
                 }
diff --git a/pinc/iso_lang_list.inc b/pinc/iso_lang_list.inc
index 2406a0f6a..01065a48d 100644
--- a/pinc/iso_lang_list.inc
+++ b/pinc/iso_lang_list.inc
@@ -15,8 +15,10 @@ function get_languages_with_dictionaries(): array
     global $aspell_prefix;
 
     $returnArray = [];
-
-    foreach (glob("$aspell_prefix/lib/aspell/*.multi") as $filename) {
+    if (($filenames = glob("$aspell_prefix/lib/aspell/*.multi")) === false) {
+        throw new RuntimeException(_("Failed to list aspell dictionaries."));
+    }
+    foreach ($filenames as $filename) {
         // dictionaries need to map to a two- or three-letter language code
         if (preg_match("#/(\w{2,3})\.multi\$#", $filename, $matches)) {
             $langname = langname_for_langcode($matches[1]);
diff --git a/pinc/project_quick_check.inc b/pinc/project_quick_check.inc
index 3e9199f7f..ed7bb4706 100644
--- a/pinc/project_quick_check.inc
+++ b/pinc/project_quick_check.inc
@@ -320,7 +320,12 @@ function _test_project_for_illo_images(string $projectid): PQCResult
         $page_image_names = $project->get_page_names_from_db();
 
         chdir($project->dir);
-        $existing_image_names = glob("*.{png,jpg}", GLOB_BRACE);
+        if (($existing_image_names = glob("*.{png,jpg}", GLOB_BRACE)) === false) {
+            throw new RuntimeException(sprintf(
+                _("Failed to list page images for %s."),
+                $project->projectid
+            ));
+        }
         // That returns a sorted list of the .png files
         // followed by a sorted list of the .jpg files,
         // but we want the two lists interleaved...
diff --git a/pinc/showavailablebooks.inc b/pinc/showavailablebooks.inc
index 4cd22853a..37f58d0ed 100644
--- a/pinc/showavailablebooks.inc
+++ b/pinc/showavailablebooks.inc
@@ -554,11 +554,13 @@ function show_project_listing(
                 // Uploaded is a special case because it is pulled from the
                 // filesystem and not from the database, and is hence not sortable.
                 global $projects_dir;
-                if ($done_files = glob("$projects_dir/{$book['projectid']}/*smooth_done_*.zip")) {
-                    $num_done = count($done_files);
-                } else {
-                    $num_done = 0;
+                if (($done_files = glob("$projects_dir/{$book['projectid']}/*smooth_done_*.zip")) === false) {
+                    throw new RuntimeException(sprintf(
+                        _("Failed to list smoothread uploads for %s."),
+                        $book['projectid']
+                    ));
                 }
+                $num_done = count($done_files);
                 $cell = $num_done;
             } elseif ($col_id == "days_avail" || $col_id == "days_left") {
                 $cell = sprintf("%.1f", $book[$col_id]);