in php7.1, the addition of two strings will report an error as long as one of the non-numeric characters is non-numeric, and non-numeric characters cannot be automatically converted to numeric values, such as" alphanumeric characters"or "1numerical characters". In php7.0, characters are automatically converted to numeric values when two strings are added. Is it automatically converted when string operations are not supported in version 7.1 and later? Or is it a problem with php configuration?
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