Predefined Constants

It is possible to identify at runtime which iconv implementation is adopted by this extension.

**`iconv` implementation constants**
Name	Type	Description
`ICONV_IMPL`	string	The implementation name
`ICONV_VERSION`	string	The implementation version

Note:
Writing implementation-dependent scripts with these constants is strongly discouraged.

The following constants are also available:

**Other `iconv` constants**
Name	Type	Description
`ICONV_MIME_DECODE_STRICT`	int	A bitmask used for iconv_mime_decode()
`ICONV_MIME_DECODE_CONTINUE_ON_ERROR`	int	A bitmask used for iconv_mime_decode()

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