In-depth analysis of php htmlspecialchars() and shtmlspecialchars() functions

In-depth analysis of php htmlspecialchars() and shtmlspecialchars() functions_PHP tutorial

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Release： 2016-07-21 15:09:24

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Definition and usage
The htmlspecialchars() function converts some predefined characters into HTML entities.

The predefined characters for

are:
•& (ampersand) becomes &
•" (double quote) becomes "
•' (single quote) Quotes) becomes '
•< (less than) becomes <
•> (greater than) becomes>
Syntax
htmlspecialchars(string,quotestyle, character-set)

Parameters

Description

string

Required. Specifies the string to be converted.

quotestyle

参数

描述

string

必需。规定要转换的字符串。

quotestyle

可选。规定如何编码单引号和双引号。

ENT_COMPAT - 默认。仅编码双引号。
ENT_QUOTES - 编码双引号和单引号。
ENT_NOQUOTES - 不编码任何引号。

character-set

可选。字符串值，规定要使用的字符集。

ISO-8859-1 - 默认。西欧。
ISO-8859-15 - 西欧（增加 Euro 符号以及法语、芬兰语字母）。
UTF-8 - ASCII 兼容多字节 8 比特 Unicode
cp866 - DOS 专用 Cyrillic 字符集
cp1251 - Windows 专用 Cyrillic 字符集
cp1252 - Windows 专用西欧字符集
KOI8-R - 俄语
GB2312 - 简体中文，国家标准字符集
BIG5 - 繁体中文
BIG5-HKSCS - Big5 香港扩展
Shift_JIS - 日语
EUC-JP - 日语

Optional. Specifies how single and double quotes are encoded.

ENT_COMPAT - Default. Only double quotes are encoded.
ENT_QUOTES - Encodes double and single quotes.
ENT_NOQUOTES - Do not encode any quotes.

character-set

Optional. String value specifying the character set to use.

ISO-8859-1 - Default. Western Europe.

ISO-8859-15 - Western Europe (adds Euro symbol and French and Finnish letters).

UTF-8 - ASCII compatible multi-byte 8-bit Unicode

cp866 - DOS-specific Cyrillic character set

cp1251 - Cyrillic character set for Windows

cp1252 - Windows-specific Western European character set

KOI8-R - Russian

GB2312 - Simplified Chinese, national standard character set

BIG5 - Traditional Chinese

BIG5-HKSCS - Big5 Hong Kong Extension

Shift_JIS - Japanese

EUC-JP - Japanese

Tips and Notes

Tip:

Unrecognized character sets will be ignored and replaced by ISO-8859-1. Example

Copy code

 The code is as follows:



 
  $str = "John & 'Adams'";
 echo htmlspecialchars($str, ENT_COMPAT);
 echo "
";
 echo htmlspecialchars($ str, ENT_QUOTES);
 echo "
";
 echo htmlspecialchars($str, ENT_NOQUOTES);
 ?>

Browser output:

Copy code

 The code is as follows:

John & ' Adams'

John & 'Adams'
John & 'Adams'

If you view the source code in a browser, you'll see this HTML:

Copy code

 The code is as follows:

                                                                                                                                                                          John & 'Adams'
John & 'Adams'

============== ================================================== ========shtmlspecialchars() function is just the opposite

Definition and usage The htmlspecialchars() function converts some predefined characters into HTML entities. The predefined characters are: amp; " (double quote) becomes ' (single quote) becomes (less than...