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LII. iconv Functions
Introduction
This module contains an interface to iconv character set conversion facility. With this module, you can turn a string represented by a local character set into the one represented by another character set, which may be the Unicode character set. Supported character sets depend on the iconv implementation of your system. Note that the iconv function on some systems may not work as you expect. In such case, it'd be a good idea to install the GNU libiconv library. It will most likely end up with more consistent results.
Since PHP 5.0.0, this extension comes with various utility functions that help you to write multilingual scripts. Let's have a look at the following sections to explore the new features.
Requirements
You will need nothing if the system you are using is one of the recent POSIX-compliant systems because standard C libraries that are supplied in them must provide iconv facility. Otherwise, you have to get the libiconv library installed in your system.
Installation
To use functions provided by this module, the PHP binary must be built with the following configure line: --with-iconv[=DIR].
Note to Windows® Users: In order to enable this module on a Windows® environment, you need to put a DLL file named iconv.dll or iconv-1.3.dll (prior to 4.2.1) which is bundled with the PHP/Win32 binary package into a directory specified by the PATH environment variable or one of the system directories of your Windows® installation.
This module is part of PHP as of PHP 5 thus iconv.dll and php_iconv.dll is not needed anymore.
Runtime Configuration
The behaviour of these functions is affected by settings in php.ini.
Table 1. Iconv configuration options
| Name | Default | Changeable | Changelog |
|---|---|---|---|
| iconv.input_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5. |
| iconv.output_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5. |
| iconv.internal_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5. |
Note: Configuration option iconv.input_encoding is currently not used for anything.
Resource Types
This extension has no resource types defined.
Predefined Constants
Since PHP 4.3.0 it is possible to identify at runtime which iconv implementation is adopted by this extension.
Table 2. iconv 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.
Since PHP 5.0.0, the following constants are also available:
Table 3. iconv constants available since PHP 5.0.0
| Name | Type | Description |
|---|---|---|
| ICONV_MIME_DECODE_STRICT | integer | A bitmask used for iconv_mime_decode() |
| ICONV_MIME_DECODE_CONTINUE_ON_ERROR | integer | A bitmask used for iconv_mime_decode() |
See Also
See also GNU Recode functions.
- Table of Contents
- iconv_get_encoding -- Retrieve internal configuration variables of iconv extension
- iconv_mime_decode_headers -- Decodes multiple MIME header fields at once
- iconv_mime_decode -- Decodes a MIME header field
- iconv_mime_encode -- Composes a MIME header field
- iconv_set_encoding -- Set current setting for character encoding conversion
- iconv_strlen -- Returns the character count of string
- iconv_strpos -- Finds position of first occurrence of a needle within a haystack
- iconv_strrpos -- Finds the last occurrence of a needle within the specified range of haystack
- iconv_substr -- Cut out part of a string
- iconv -- Convert string to requested character encoding
- ob_iconv_handler -- Convert character encoding as output buffer handler
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Generated: 2007-01-26 18:00:28