04d5402e2f
Summary:
Fixes T5545. We assume `strlen()` returns the number of bytes in a string, which is the normal behavior (and the documented behavior).
There's a config option, `mbstring.func_overload`, which silently calls mb_strlen() instead. This may return some other result, might fail, etc., and there's no way to get the byte length of a string if this option is set.
If this option is set, fatal immediately. Nothing good can ever come of it.
Test Plan: {F173990}
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T5545
Differential Revision: https://secure.phabricator.com/D9811
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