Merge branch '3.4' into 4.4

* 3.4:
  [VarDumper] fix for change in PHP 7.4.6
  Added regression test for AccountStatusException behavior (ref #36822)
  embed resource name in error message
  [Serializer] fix issue with PHP 8
  [Yaml] Fix escaped quotes in quoted multi-line string

Author: nicolas-grekas

Parser.php

@@ -756,7 +756,8 @@ private function parseValue(string $value, int $flags, string $context)
                 $lines[] = trim($this->currentLine);
 
                 // quoted string values end with a line that is terminated with the quotation character
-                if ('' !== $this->currentLine && substr($this->currentLine, -1) === $quotation) {
+                $escapedLine = str_replace(['\\\\', '\\"'], '', $this->currentLine);
+                if ('' !== $escapedLine && substr($escapedLine, -1) === $quotation) {
                     break;
                 }
             }

Tests/ParserTest.php

@@ -1530,6 +1530,33 @@ public function testBlankLinesInQuotedMultiLineString()
         $this->assertSame($expected, $this->parser->parse($yaml));
     }
 
+    public function testEscapedQuoteInQuotedMultiLineString()
+    {
+        $yaml = <<<YAML
+foobar: "foo
+    \\"bar\\"
+    baz"
+YAML;
+        $expected = [
+            'foobar' => 'foo "bar" baz',
+        ];
+
+        $this->assertSame($expected, $this->parser->parse($yaml));
+    }
+
+    public function testBackslashInQuotedMultiLineString()
+    {
+        $yaml = <<<YAML
+foobar: "foo
+    bar\\\\"
+YAML;
+        $expected = [
+            'foobar' => 'foo bar\\',
+        ];
+
+        $this->assertSame($expected, $this->parser->parse($yaml));
+    }
+
     public function testParseMultiLineUnquotedString()
     {
         $yaml = <<<EOT