Issue #3477324 by andypost, alexpott: Fix usage of str_getcsv() and fgetcsv() for PHP 8.4

(cherry picked from commit 9cf58fe1)

core/lib/Drupal/Core/Mail/Plugin/Mail/PhpMail.php

@@ -98,7 +98,7 @@ public function mail(array $message) {
       if (in_array(strtolower($name), self::MAILBOX_LIST_HEADERS, TRUE)) {
         // Split values by comma, but ignore commas encapsulated in double
         // quotes.
-        $value = str_getcsv($value, ',');
+        $value = str_getcsv($value, escape: '\\');
       }
       $headers->addHeader($name, $value);
     }

core/lib/Drupal/Core/Mail/Plugin/Mail/SymfonyMailer.php

@@ -127,7 +127,7 @@ public function mail(array $message) {
           if (in_array(strtolower($name), self::MAILBOX_LIST_HEADERS, TRUE)) {
             // Split values by comma, but ignore commas encapsulated in double
             // quotes.
-            $value = str_getcsv($value, ',');
+            $value = str_getcsv($value, escape: '\\');
           }
           $headers->addHeader($name, $value);
         }

core/modules/migrate_drupal/tests/src/Traits/ValidateMigrationStateTestTrait.php

@@ -125,7 +125,7 @@ public function testMigrationState(): void {
     // Assert that each discovered migration has a corresponding declaration
     // in a migrate_drupal.yml.
     foreach ($discovered_unique as $datum) {
-      $data = str_getcsv($datum);
+      $data = str_getcsv($datum, escape: '');
       $in_finished = in_array($datum, $declared_unique[MigrationState::FINISHED]);
       $in_not_finished = in_array($datum, $declared_unique[MigrationState::NOT_FINISHED]);
       $found = $in_finished || $in_not_finished;
@@ -137,7 +137,7 @@ public function testMigrationState(): void {
     // not finished.
     $discovered_not_finished = array_diff($discovered_unique, $declared_unique[MigrationState::FINISHED]);
     foreach ($discovered_not_finished as $datum) {
-      $data = str_getcsv($datum);
+      $data = str_getcsv($datum, escape: '');
       $this->assertContains($datum, $declared_unique[MigrationState::NOT_FINISHED], sprintf("No migration found for version '%s' with source_module '%s' and destination_module '%s' declared in module '%s'", $version, $data[1], $data[2], $data[0]));
     }
   }

core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php

@@ -184,9 +184,9 @@ protected function readMultilingualContent($filename) {
     foreach ($translated_languages as $language) {
       if (file_exists($default_content_path . "$language/$filename") &&
       ($handle = fopen($default_content_path . "$language/$filename", 'r')) !== FALSE) {
-        $header = fgetcsv($handle);
+        $header = fgetcsv($handle, escape: '');
         $line_counter = 0;
-        while (($content = fgetcsv($handle)) !== FALSE) {
+        while (($content = fgetcsv($handle, escape: '')) !== FALSE) {
           $keyed_content[$language][$line_counter] = array_combine($header, $content);
           $line_counter++;
         }