Description:
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It appears that in 5.5, "#61537 json_encode() incorrectly truncates/discards information" has been addressed. php 5.4 and 5.3 also had this patch at some point but it was reverted later. I assume this was done for not breaking backcompat in point releases.

However, the php 5.5 Changelog fails to mentioned that json_encode changed behaviour and now behaves as documented. specifically: "Returns a JSON encoded string on success or FALSE on failure."

the documentation also fails to mention the new constant `JSON_PARTIAL_OUTPUT_ON_ERROR`. well, it actually mentions it by referencing to it but it is not listed as a proper item.

Test script:
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echo json_encode(["foo" => chr(132), "bar" => "bar"]);
// nothing, false
// this used to return "Expected result"

Expected result:
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since the Changelog does not mention anything json-related, I'd expect the same behaviour as in previous versions:

echo json_encode(["foo" => chr(132), "bar" => "bar"]);
PHP Warning:  json_encode(): Invalid UTF-8 sequence in argument in php shell code on line 1
{"foo":null,"bar":"bar"}

Actual result:
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false