diff --git a/src/Symfony/Component/Yaml/CHANGELOG.md b/src/Symfony/Component/Yaml/CHANGELOG.md
index 70d392da343ee..a375859ada3b8 100644
--- a/src/Symfony/Component/Yaml/CHANGELOG.md
+++ b/src/Symfony/Component/Yaml/CHANGELOG.md
@@ -1,6 +1,11 @@
CHANGELOG
=========
+4.1.0
+-----
+
+ * Added support to dump `null` values as `~` through the `Yaml::DUMP_NULL_AS_TILDE` flag.
+
4.0.0
-----
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index abab86903b8d3..3b85fda7cd88d 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -127,7 +127,7 @@ public static function dump($value, int $flags = 0): string
throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value)));
}
- return 'null';
+ return self::getNullRepresentationValue($flags);
case $value instanceof \DateTimeInterface:
return $value->format('c');
case is_object($value):
@@ -153,11 +153,11 @@ public static function dump($value, int $flags = 0): string
throw new DumpException('Object support when dumping a YAML file has been disabled.');
}
- return 'null';
+ return self::getNullRepresentationValue($flags);
case is_array($value):
return self::dumpArray($value, $flags);
case null === $value:
- return 'null';
+ return self::getNullRepresentationValue($flags);
case true === $value:
return 'true';
case false === $value:
@@ -738,4 +738,13 @@ private static function getHexRegex(): string
{
return '~^0x[0-9a-f_]++$~i';
}
+
+ private static function getNullRepresentationValue(int $flags): string
+ {
+ if (Yaml::DUMP_NULL_AS_TILDE & $flags) {
+ return '~';
+ }
+
+ return 'null';
+ }
}
diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
index 0a8c023d017fe..d3b4afe4008a4 100644
--- a/src/Symfony/Component/Yaml/Tests/DumperTest.php
+++ b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -421,6 +421,11 @@ public function testNegativeIndentationThrowsException()
{
new Dumper(-4);
}
+
+ public function testDumpNullAsTilde()
+ {
+ $this->assertSame('{ foo: ~ }', $this->dumper->dump(array('foo' => null), 0, 0, Yaml::DUMP_NULL_AS_TILDE));
+ }
}
class A
diff --git a/src/Symfony/Component/Yaml/Yaml.php b/src/Symfony/Component/Yaml/Yaml.php
index 80de7e877723c..28f4b163d0431 100644
--- a/src/Symfony/Component/Yaml/Yaml.php
+++ b/src/Symfony/Component/Yaml/Yaml.php
@@ -33,6 +33,7 @@ class Yaml
const PARSE_CONSTANT = 256;
const PARSE_CUSTOM_TAGS = 512;
const DUMP_EMPTY_ARRAY_AS_SEQUENCE = 1024;
+ const DUMP_NULL_AS_TILDE = 2048;
/**
* Parses a YAML file into a PHP value.
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