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What does ~ mean in the YML configuration file in Symfony 2?
For example:
NotBlank: ~ 
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What is It? The Symfony Yaml component parses YAML strings to convert them to PHP arrays. It is also able to convert PHP arrays to YAML strings. YAML, YAML Ain't Markup Language, is a human friendly data serialization standard for all programming languages. YAML is a great format for your configuration files.
YAML is a digestible data serialization language often used to create configuration files with any programming language. Designed for human interaction, YAML is a strict superset of JSON, another data serialization language. But because it's a strict superset, it can do everything that JSON can and more.
The config. yaml file contains all the configuration settings that are needed to deploy your cluster. From the config. yaml file, you can customize your installation by using various parameters.
Click the folder icon in the top left of the file editor window to open the file browser sidebar. Click the configuration. yaml file (in the /config/ folder) to load it into the main file editor window.
In Yaml, ~ means null. (source)
The actual meaning in Symfony 2 depends on what you are configuring. Most likely it will mean "use defaults" or it will be used where it is needed to put a configuration key but there is nothing to actually configure for that key (as in the NotBlank example).
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