It is possible to identify at
  runtime which iconv implementation is adopted by this extension.
  
| Name | Type | Description | 
|---|---|---|
| ICONV_IMPL | string | The implementation name | 
| ICONV_VERSION | string | The implementation version | 
Зауваження:
Writing implementation-dependent scripts with these constants is strongly discouraged.
The following constants are also available:
| 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() | 
