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I'm trying to define a few environment variables for a PHP application but one of these variables contains the "$" sign. When I test the configuration file with nginx -t, I get an error message telling me that a variable does not exist. It seems to interpret the text after "$" as a variable name, which is of course not defined.

Maybe I did not search in the right places, but I couldn't find information about how to escape the "$" character. Is that possible and how can it be done?

Update: I tried to enclose the value between single quotes and double quotes following d3ag0s's comment but I had the same error message.

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    Try using quotes for your environment variable that contain special characters. Commented Jun 8, 2017 at 8:41
  • I just did (using ' and ") but unfortunately it does not change the error message. Commented Jun 8, 2017 at 8:44
  • Try setting the variable set $myvar "$environmentvariable" then use $myvar instead Commented Jun 8, 2017 at 9:08
  • I just tried it as well but unfortunately, the value is still being evaluated in the variable assignment. Commented Jun 8, 2017 at 9:22
  • Have you tried \$ ? Commented Jun 8, 2017 at 9:31

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According to this page, it is not possible to escape the $ sign, but they provide a workaround:

https://openresty.org/download/agentzh-nginx-tutorials-en.html#nginx-variables-escaping-dollar

geo $dollar { default "$"; } server { listen 8080; location /test { echo "This is a dollar sign: $dollar"; } }

Although it might not be the best solution, I have tested it and it works.

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  • OMG this is a f--king terrible 'solution'. I have to define a variable in a file completely separate from my fastcgi_params file to get it in my fastcgi_params file? How do you even pass this off from nginx to FPM? Commented Jan 8, 2020 at 18:31
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    @tpartee good day to you too. I don't understand your comment, because you don't need to declare the variable in a separate file, I certainly did not. You can pass a variable from nginx to FPM with: fastcgi_param VAR_NAME value; Commented Jan 9, 2020 at 8:56

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