An in depth analysis of php htmlspecialchars of and shtmlspecialchars of functions
- 2020-06-07 04:07:04
- OfStack
Definition and usage
The htmlspecialchars() function converts 1 of the predefined characters to HTML entities.
The predefined characters are:
•
&
(and sign) become
&
amp;
The & # 8226;" (double quotes) becomes
&
quot;
The & # 8226; '(single quote) becomes
&
#039;
•
<
(less than) become
&
lt;
•
>
(greater than) become
&
gt;
grammar
htmlspecialchars(string,quotestyle,character-set)
parameter
describe
string
A necessity. Specifies the string to be converted.
quotestyle
Optional. Specifies how to encode single and double quotes.
ENT_COMPAT - Default. Encode only double quotes. ENT_QUOTES - encodes double and single quotes. ENT_NOQUOTES - does not encode any quotes. character-setOptional. String value, specifying the character set to be used.
ISO-8859-1 - Default. Western Europe. ISO-8859-15 - Western Europe (added Euro symbols and French and Finnish letters). UTF-8-ASCII is compatible with multi-byte 8-bit Unicode cp866-DOS Special Cyrillic Character Set cp1251-Windows Special Cyrillic Character Set cp 1252-Windows Special Western European Character set KOI8 R - Russian GB2312 - Simplified Chinese character Set, National Standard character Set BIG5 - Traditional Chinese BIG5-HKSCS-Big5 Hong Kong Extension Shift_JIS - Japanese EUC JP - JapaneseHints and comments
Tip: Unrecognized character sets will be ignored and replaced by ISO-8859-1.
example
<html>
<body>
<?php
$str = "John & 'Adams'";
echo htmlspecialchars($str, ENT_COMPAT);
echo "<br />";
echo htmlspecialchars($str, ENT_QUOTES);
echo "<br />";
echo htmlspecialchars($str, ENT_NOQUOTES);
?>
</body>
</html>
Browser output:
John & 'Adams'
John & 'Adams'
John & 'Adams'
If you look at the source code in a browser, you'll see these HTML:
<html>
<body>
John & 'Adams'<br />John & 'Adams'<br />John & 'Adams' </body>
</html>
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The shtmlspecialchars() function is the opposite