diff --git a/src/Symfony/Component/Yaml/CHANGELOG.md b/src/Symfony/Component/Yaml/CHANGELOG.md
index 1bc5561ba3db8..51e358b6bbfda 100644
--- a/src/Symfony/Component/Yaml/CHANGELOG.md
+++ b/src/Symfony/Component/Yaml/CHANGELOG.md
@@ -1,6 +1,11 @@
CHANGELOG
=========
+4.4.0
+-----
+
+ * Added support to dump `null` as `~` by using the `Yaml::DUMP_NULL_AS_TILDE` flag.
+
4.3.0
-----
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 4b12b9b11a9ba..c028ccf071740 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -33,6 +33,7 @@ class Inline
private static $objectSupport = false;
private static $objectForMap = false;
private static $constantSupport = false;
+ private static $nullAsTilde = false;
/**
* @param int $flags
@@ -45,6 +46,7 @@ public static function initialize($flags, $parsedLineNumber = null, $parsedFilen
self::$objectSupport = (bool) (Yaml::PARSE_OBJECT & $flags);
self::$objectForMap = (bool) (Yaml::PARSE_OBJECT_FOR_MAP & $flags);
self::$constantSupport = (bool) (Yaml::PARSE_CONSTANT & $flags);
+ self::$nullAsTilde = (bool) (Yaml::DUMP_NULL_AS_TILDE & $flags);
self::$parsedFilename = $parsedFilename;
if (null !== $parsedLineNumber) {
@@ -129,7 +131,7 @@ public static function dump($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::dumpNull($flags);
case $value instanceof \DateTimeInterface:
return $value->format('c');
case \is_object($value):
@@ -155,11 +157,11 @@ public static function dump($value, int $flags = 0): string
throw new DumpException('Object support when dumping a YAML file has been disabled.');
}
- return 'null';
+ return self::dumpNull($flags);
case \is_array($value):
return self::dumpArray($value, $flags);
case null === $value:
- return 'null';
+ return self::dumpNull($flags);
case true === $value:
return 'true';
case false === $value:
@@ -256,6 +258,15 @@ private static function dumpArray(array $value, int $flags): string
return sprintf('{ %s }', implode(', ', $output));
}
+ private static function dumpNull(int $flags): string
+ {
+ if (Yaml::DUMP_NULL_AS_TILDE & $flags) {
+ return '~';
+ }
+
+ return 'null';
+ }
+
/**
* Parses a YAML scalar.
*
diff --git a/src/Symfony/Component/Yaml/Tests/DumperTest.php b/src/Symfony/Component/Yaml/Tests/DumperTest.php
index 24d956b09bb1d..d83733801d8f3 100644
--- a/src/Symfony/Component/Yaml/Tests/DumperTest.php
+++ b/src/Symfony/Component/Yaml/Tests/DumperTest.php
@@ -513,6 +513,11 @@ public function testNegativeIndentationThrowsException()
{
new Dumper(-4);
}
+
+ public function testDumpNullAsTilde()
+ {
+ $this->assertSame('{ foo: ~ }', $this->dumper->dump(['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 94a5e4ad7d7d4..4efceb3e25912 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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