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GrowthBook Users

I think we were concerned it would have side effects for existing users

no side effects, essentially a null and empty string are treated the same except in newer version of PHP the function is typed and expects a string only so it throws when it gets a null. this PR just coalesces the null to empty string which is what was kind of happening behind the scenes before so now this just makes it explicit up front.

I think its more the removing of the error supressing

okay, checked with the team, we're going to merge it soon

<https://github.com/growthbook/growthbook-php/releases/tag/v1.3.0>