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# utf8_encode

(PHP 3>= 3.0.6, PHP 4 , PHP 5)

utf8_encode -- Encodes an ISO-8859-1 string to UTF-8

## Description

string utf8_encode ( string data)

This function encodes the string data to UTF-8, and returns the encoded version. UTF-8 is a standard mechanism used by Unicode for encoding wide character values into a byte stream. UTF-8 is transparent to plain ASCII characters, is self-synchronized (meaning it is possible for a program to figure out where in the bytestream characters start) and can be used with normal string comparison functions for sorting and such. PHP encodes UTF-8 characters in up to four bytes, like this:

表格 1.UTF-8 encoding

bytes | bits | representation
--- | --- | ---
1 | 7 | 0bbbbbbb
2 | 11 | 110bbbbb 10bbbbbb
3 | 16 | 1110bbbb 10bbbbbb 10bbbbbb
4 | 21 | 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb

Each b represents a bit that can be used to store character data.

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