# 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) | string | The implementation name
`ICONV_VERSION` (string) | 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) | int | A bitmask used for iconv_mime_decode()
`ICONV_MIME_DECODE_CONTINUE_ON_ERROR` (int) | int | A bitmask used for iconv_mime_decode()

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