infer non-empty-string on strstr() comparison with constant string #1365
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similar to #1259
refs phpstan/phpstan#6792
I think we should also coverstrchr,strrchrbut in a separate PR-> I think we should also cover
strpbrk,strtoupper,strtolower,mb_strtoupper,mb_strtolower,ucfirst,lcfirst,ucwordsbut in a separate PR