symfony
diff --git a/‎src/Symfony/Component/Yaml/Dumper.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Yaml/Dumper.php
+4-1Lines changed: 4 additions & 1 deletion b/‎src/Symfony/Component/Yaml/Dumper.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Yaml/Dumper.php
+4-1Lines changed: 4 additions & 1 deletion
@@ -98,7 +98,10 @@ public function dump($input, $inline = 0, $indent = 0, $flags = 0)
 
             foreach ($input as $key => $value) {
                 if ($inline >= 1 && Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && is_string($value) && false !== strpos($value, "\n") && false === strpos($value, "\r\n")) {
-                    $output .= sprintf("%s%s%s |\n", $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', '');
+                    // If the first line starts with a space character, the spec requires a blockIndicationIndicator
+                    // http://www.yaml.org/spec/1.2/spec.html#id2793979
+                    $blockIndentationIndicator = (' ' === substr($value, 0, 1)) ? (string) $this->indentation : '';
+                    $output .= sprintf("%s%s%s |%s\n", $prefix, $dumpAsMap ? Inline::dump($key, $flags).':' : '-', '', $blockIndentationIndicator);
 
                     foreach (preg_split('/\n|\r\n/', $value) as $row) {
                         $output .= sprintf("%s%s%s\n", $prefix, str_repeat(' ', $this->indentation), $row);