Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1

Question

All my services and parameters from services.yml are striked and I get the message "Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1". But I am using Symfony 2.6 and I don't want to put the values in quotes since it is not needed for this version. This happened only after I updated my Symfony Plugin for PhpStorm 2016.1

What can I do to avoid this? (using PhpStorm 10 or using an older plugin is not an option)

Answer 1

What you need to do is embrace it with double quotes.

Before:

services:
  foo.class:
    class: Foo\Class
    arguments:
      - @some.service
      - %some.parameter%

After:

services:
  foo.class:
    class: Foo\Class
    arguments:
      - "@some.service"
      - "%some.parameter%"

Answer 2

The inspection you mention is not provided by PhpStorm 2016.1 but by the Symfony Plugin plugin.

As with any other inspection, it can be easily disabled if you press Alt-Enter^* or click on the yellow bulb that appears at the start of the offending line then select Disable inspection from the submenu of Inspection 'Yaml escaped \ in quoted inspection' options.

You can also find this inspection in the Settings/Preference window, under Editor -> Inspections -> Symfony -> Twig.

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* I am using PhpStorm on OSX and this is the key combination on the default keymap.

Answer 3

starting with the “%” is deprecated since the version 2.8 ;)

New in Symfony 2.8: YAML deprecations