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if flags is set to report_errors, an error message will be displayed is there is an error during conversion.
php_stream_cast() attempts to convert stream into a resource indicated by castas. if ret is null, the stream is queried to find out if such a conversion is possible, without actually performing the conversion (however, some internal stream state *might* be changed in this case). if flags is set to report_errors, an error message will be displayed is there is an error during conversion.