htmlspecialchars

Name:htmlspecialchars

Category:String

Programming Language:php

One-line Description:Convert some predefined characters to HTML entities.

Definition and usage

htmlspecialchars() function converts predefined characters into HTML entities.

The predefined characters are:

& (Hannual) Become &
" (double quotes) become"
' (single quotes) becomes'
< (less than) becomes <
> (greater than) become >

Tip: If you need to convert special HTML entities back to characters, please use the htmlspecialchars_decode() function.

grammar

 htmlspecialchars ( string , flags , character - set , double_encode )

parameter	describe
string	Required. Specifies the string to be converted.
flags	Optional. Specifies how to deal with quotes, invalid encodings, and which document type to use. Available quote types: ENT_COMPAT - Default. Encode only double quotes. ENT_QUOTES - Encoded double and single quotes. ENT_NOQUOTES - No quotation marks are encoded. Invalid encoding: ENT_IGNORE - Ignore invalid encoding instead of having the function return an empty string. It should be avoided as it may have a security impact. ENT_SUBSTITUTE - Replaces invalid encodings with a specified character with Unicode substitution U+FFFD (UTF-8) or &#FFFD; instead of returning an empty string. ENT_DISALLOWED - Replace invalid code points in the specified document type with Unicode substitution characters U+FFFD (UTF-8) or &#FFFD;. Additional flags for the document type used: ENT_HTML401 - Default. Process code as HTML 4.01. ENT_HTML5 - Process code as HTML 5. ENT_XML1 - Process code as XML 1. ENT_XHTML - Process code as XHTML.
character-set	Optional. A string that specifies the character set to be used. Allowed values: UTF-8 - Default. ASCII compatible with multi-byte 8-bit Unicode ISO-8859-1 - Western Europe ISO-8859-15 - Western Europe (added to the Euro symbol + missing French and Finnish letters in ISO-8859-1) cp866 - DOS-specific Cyrillic character set cp1251 - Windows-specific Cyrillic character set cp1252 - Windows-specific Western European character set KOI8-R - Russian BIG5 - Traditional Chinese, mainly used in Taiwan GB2312 - Simplified Chinese, national standard character set BIG5-HKSCS - Big5 with Hong Kong expansion Shift_JIS - Japanese EUC-JP - Japanese MacRoman - Character set used by Mac operating system Note: In versions prior to PHP 5.4, unrecognized character sets will be ignored and replaced by ISO-8859-1. Since PHP 5.4, unrecognized character sets will be ignored and replaced by UTF-8.
double_encode	Optional. Boolean value specifies whether to encode an existing HTML entity. TRUE - Default. Each entity will be converted. FALSE - The HTML entity that already exists is not encoded.