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mb_internal_encoding() sets internal character encoding to encoding If parameter is omitted, it returns current internal encoding.
encoding is used for HTTP input character encoding conversion, HTTP output character encoding conversion and default character encoding for string functions defined by mbstring module.
encoding: Character encoding name
Return Value: If encoding is set,mb_internal_encoding() returns TRUE for success, otherwise returns FALSE. If encoding is omitted, it returns current character encoding name.
See also mb_http_input(), mb_http_output(), mb_detect_order().