htmlentities

Description

string htmlentities ( string string [, int quote_style [, string charset]] )

This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities.

Like htmlspecialchars(), the optional second quote_style parameter lets you define what will be done with 'single' and "double" quotes. It takes on one of three constants with the default being ENT_COMPAT:

表格 1. Available quote_style constants

Constant Name	Description
`ENT_COMPAT`	Will convert double-quotes and leave single-quotes alone.
`ENT_QUOTES`	Will convert both double and single quotes.
`ENT_NOQUOTES`	Will leave both double and single quotes unconverted.

Support for the optional quote parameter was added in PHP 4.0.3.

Like htmlspecialchars(), it takes an optional third argument charset which defines character set used in conversion. Support for this argument was added in PHP 4.1.0. Presently, the ISO-8859-1 character set is used as the default.

PHP 4.3.0 及其後續版本支援如下字集。

表格 2. 已支援字集

字集	別名	描述
ISO-8859-1	ISO8859-1	西歐，Latin-1
ISO-8859-15	ISO8859-15	西歐，Latin-9。增加了 Latin-1（ISO-8859-1）中缺少的歐元符號、法國及芬蘭字母。
UTF-8		ASCII 相容多位元組 8-bit Unicode。
cp866	ibm866, 866	DOS-特有的 Cyrillic 字母字集。PHP 4.3.2 開始支援該字集。
cp1251	Windows-1251, win-1251, 1251	Windows-特有的 Cyrillic 字母字集。PHP 4.3.2 開始支援該字集。
cp1252	Windows-1252, 1252	Windows 對於西歐特有的字集。
KOI8-R	koi8-ru, koi8r	俄文。PHP 4.3.2 開始支援該字集。
BIG5	950	繁體中文，主要用於中國台灣。
GB2312	936	繁體中文，國際標準字集。
BIG5-HKSCS		繁體中文，Big5 的延伸，主要用於香港。
Shift_JIS	SJIS, 932	日文。
EUC-JP	EUCJP	日文。

注: ISO-8859-1 將代替任何其它無法識別的字集。

If you're wanting to decode instead (the reverse) you can use html_entity_decode().

例子 1. A htmlentities() example
<?php $str = "A 'quote' is bold"; // Outputs: A 'quote' is bold echo htmlentities($str); // Outputs: A 'quote' is bold echo htmlentities($str, ENT_QUOTES); ?>