Description:
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---
From manual page: http://www.php.net/function.http-build-query
---
The function http_build_query encodes special charaters that don't need to be encoded.

The problem here is that the query might get bigger than it has to be.

According to the RFC 1738 document mentioned in the manual these characters don't have to be encoded:
>   Thus, only alphanumerics, the special characters "$-_.+!*'(),", and
>   reserved characters used for their reserved purposes may be used
>   unencoded within a URL.

Test script:
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var_dump(http_build_query(['a' => '$-_.+!*\'(),']));

Expected result:
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string(13) "a=$-_.+!*'(),"

Actual result:
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string(29) "a=%24-_.%2B%21%2A%27%28%29%2C"