How to reverse htmlentities() / What is the opposite of htmlentities()?

PHP: How to reverse htmlentities() / What is the opposite of htmlentities()?

If you need to reverse or undo htmlentities() you can use the following function to do so in PHP:

  1. html_entity_decode($var)

This will convert HTML entities to their corresponding characters.

Info about html_entity_decode()

There are a few flags that you can use (as the 2nd parameter):

Constant NameDescription
ENT_COMPATWill convert double-quotes and leave single-quotes alone.
ENT_QUOTESWill convert both double and single quotes.
ENT_NOQUOTESWill leave both double and single quotes unconverted.
ENT_HTML401 Handle code as HTML 4.01.
ENT_XML1 Handle code as XML 1.
ENT_XHTML Handle code as XHTML.
ENT_HTML5 Handle code as HTML 5.

You can set what encoding to use by passing an option to the 3rd parameter. By default it will use the default_charset php setting.

The following character sets are supported:

CharsetAliasesDescription
ISO-8859-1ISO8859-1 Western European, Latin-1.
ISO-8859-5ISO8859-5 Little used cyrillic charset (Latin/Cyrillic).
ISO-8859-15ISO8859-15 Western European, Latin-9. Adds the Euro sign, French and Finnish letters missing in Latin-1 (ISO-8859-1).
UTF-8  ASCII compatible multi-byte 8-bit Unicode.
cp866ibm866, 866 DOS-specific Cyrillic charset.
cp1251Windows-1251, win-1251, 1251 Windows-specific Cyrillic charset.
cp1252Windows-1252, 1252 Windows specific charset for Western European.
KOI8-Rkoi8-ru, koi8r Russian.
BIG5950 Traditional Chinese, mainly used in Taiwan.
GB2312936 Simplified Chinese, national standard character set.
BIG5-HKSCS  Big5 with Hong Kong extensions, Traditional Chinese.
Shift_JISSJIS, SJIS-win, cp932, 932 Japanese
EUC-JPEUCJP, eucJP-win Japanese
MacRoman  Charset that was used by Mac OS.
''  An empty string activates detection from script encoding (Zend multibyte), default_charset and current locale (see nl_langinfo() and setlocale()), in this order. Not recommended.
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I am a 29 year old backend web developer from London, mostly focusing on PHP and Laravel lately. This (webdevetc.com) is my blog where I write about some web development topics (PHP, Laravel, Javascript, and some server stuff). contact me here.



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