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Convert all applicable characters to HTML entities (PHP 4, PHP 5)
string htmlentities ( string string [, int quote_style [, string charset [, bool double_encode]]] )

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.

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



The input string.


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:

Table 311. Available quote_style constants

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.


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

Following character sets are supported in PHP 4.3.0 and later.

Table 312. Supported charsets

ISO-8859-1ISO8859-1 Western European, Latin-1
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. This charset is supported in 4.3.2.
cp1251Windows-1251, win-1251, 1251 Windows-specific Cyrillic charset. This charset is supported in 4.3.2.
cp1252Windows-1252, 1252 Windows specific charset for Western European.
KOI8-Rkoi8-ru, koi8r Russian. This charset is supported in 4.3.2.
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, 932 Japanese


Any other character sets are not recognized and ISO-8859-1 will be used instead.


When double_encode is turned off PHP will not encode existing html entities. The default is to convert everything.

Return Values

Returns the encoded string.


5.2.3 The double_encode parameter was added.
4.1.0 The charset parameter was added.
4.0.3 The quote_style parameter was added.


Example 2413. A htmlentities() example

= "A 'quote' is <b>bold</b>";

// Outputs: A 'quote' is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str);

// Outputs: A &#039;quote&#039; is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str, ENT_QUOTES);