。
为文档的无效代码点替换为 Unicode 代替符（Replacement Character）：
U+FFFD (UTF-8)，或 �（其他），而不是把它们留在原处。
比如以下情况下就很有用：要保证 XML 文档嵌入额外内容时格式合法。
Although this argument is technically optional, you are highly encouraged to
specify the correct value for your code
if the
configuration option may be set incorrectly for the given input.
An empty string activates detection from script encoding (Zend multibyte),
), in this order. Not recommended.
A 'quote' is <b>bold</b>
A 'quote' is <b>bold</b>
html_entity_decode()
- Convert HTML entities to their corresponding characters
get_html_translation_table()
- 返回使用 htmlspecialchars 和 htmlentities 后的转换表
htmlspecialchars()
- 将特殊字符转换为 HTML 实体
nl2br()
- 在字符串所有新行之前插入 HTML 换行标记
urlencode()
- 编码 URL 字符串
Sijmen Ruwhof
¶
14 years ago
An important note below about using this function to secure your application against Cross Site Scripting (XSS) vulnerabilities.
When printing user input in an attribute of an HTML tag, the default configuration of htmlEntities() doesn't protect you against XSS, when using single quotes to define the border of the tag's attribute-value. XSS is then possible by injecting a single quote:
<?php
$_GET
[
'a'
] =
"#000' onload='alert(document.cookie)"
;
?>
XSS possible (insecure):
<?php
$href
=
htmlEntities
(
$_GET
[
'a'
]);
print
"<body bgcolor='
$href
'>"
;
?>
Use the 'ENT_QUOTES' quote style option, to ensure no XSS is possible and your application is secure:
<?php
$href
=
htmlEntities
(
$_GET
[
'a'
],
ENT_QUOTES
);
print
"<body bgcolor='
$href
'>"
;
?>
The 'ENT_QUOTES' option doesn't protect you against javascript evaluation in certain tag's attributes, like the 'href' attribute of the 'a' tag. When clicked on the link below, the given JavaScript will get executed:
<?php
$_GET
[
'a'
] =
'javascript:alert(document.cookie)'
;
$href
=
htmlEntities
(
$_GET
[
'a'
],
ENT_QUOTES
);
print
"<a href='
$href
'>link</a>"
;
?>
j2teamnnl at gmail dot com
¶
3 years ago
The answer above is not correct for multiple languages like France
I had correct it
function xml_entities($strIn)
{
if (is_numeric($strIn)) {
return $strIn;
}
$strOut = null;
$arrStr = mb_str_split($strIn);
foreach ($arrStr as $char) {
$ord = mb_ord($char);
if (($ord > 0 && $ord < 32) || ($ord >= 127)) {
$strOut .= "&#{$ord};";
}
else {
switch ($char) {
case '<':
$strOut .= '<';
break;
case '>':
$strOut .= '>';
break;
case '&':
$strOut .= '&';
break;
case '"':
$strOut .= '"';
break;
default:
$strOut .= $char;
}
}
}
return $strOut;
}
q (dot) rendeiro (at) gmail (dot) com
¶
18 years ago
I've seen lots of functions to convert all the entities, but I needed to do a fulltext search in a db field that had named entities instead of numeric entities (edited by tinymce), so I searched the tinymce source and found a string with the value->entity mapping. So, i wrote the following function to encode the user's query with named entities.
The string I used is different of the original, because i didn't want to convert ' or ". The string is too long, so I had to cut it. To get the original check TinyMCE source and search for nbsp or other entity ;)
<?php
$entities_unmatched
=
explode
(
','
,
'160,nbsp,161,iexcl,162,cent, [...] '
);
$even
=
1
;
foreach(
$entities_unmatched
as
$c
) {
if(
$even
) {
$ord
=
$c
;
} else {
$entities_table
[
$ord
] =
$c
;
}
$even
=
1
-
$even
;
}
function
encode_named_entities
(
$str
) {
global
$entities_table
;
$encoded_str
=
''
;
for(
$i
=
0
;
$i
<
strlen
(
$str
);
$i
++) {
$ent
= @
$entities_table
[
ord
(
$str
{
$i
})];
if(
$ent
) {
$encoded_str
.=
"&
$ent
;"
;
} else {
$encoded_str
.=
$str
{
$i
};
}
}
return
$encoded_str
;
}
?>
2962051004 at qq dot com
¶
6 years ago
<?php
$str
= <<<EOT
你好 world
EOT;
function
ChineseToEntity
(
$str
) {
return
preg_replace_callback
(
'/[\x{4e00}-\x{9fa5}]/u'
,
function (
$matches
) {
$json
=
json_encode
(array(
$matches
[
0
]));
preg_match
(
'/\[\"(.*)\"\]/'
,
$json
,
$arr
);
return
'&#x'
.
str_replace
(
'\\u'
,
''
,
$arr
[
1
]).
';'
;
},
$str
);
}
echo
ChineseToEntity
(
$str
);
realcj at g mail dt com
¶
18 years ago
If you are building a loadvars page for Flash and have problems with special chars such as " & ", " ' " etc, you should escape them for flash:
Try trace(escape("&")); in flash' actionscript to see the escape code for &;
% = %25
& = %26
' = %27
<?php
function
flashentities
(
$string
){
return
str_replace
(array(
"&"
,
"'"
),array(
"%26"
,
"%27"
),
$string
);
}
?>
Those are the two that concerned me. YMMV.
phil at lavin dot me dot uk
¶
15 years ago
The following will make a string completely safe for XML:
<?php
function
philsXMLClean
(
$strin
) {
$strout
=
null
;
for (
$i
=
0
;
$i
<
strlen
(
$strin
);
$i
++) {
$ord
=
ord
(
$strin
[
$i
]);
if ((
$ord
>
0
&&
$ord
<
32
) || (
$ord
>=
127
)) {
$strout
.=
"&#
{
$ord
}
;"
;
}
else {
switch (
$strin
[
$i
]) {
case
'<'
:
$strout
.=
'<'
;
break;
case
'>'
:
$strout
.=
'>'
;
break;
case
'&'
:
$strout
.=
'&'
;
break;
case
'"'
:
$strout
.=
'"'
;
break;
default:
$strout
.=
$strin
[
$i
];
}
}
}
return
$strout
;
}
?>
hajo-p
¶
11 years ago
The flag ENT_HTML5 also strips newline chars like \n with htmlentities while htmlspecialchars is not affected by that.
If you want to use nl2br on that string afterwards you might end up searching the problem like i did. This does not apply to other flags like e.g. ENT_XHTML which confused me.
Tested this with PHP 5.4 / 5.5 / 5.6-dev with same results, so it seems that this is an intended "feature".
ustimenko dot alexander at gmail dot com
¶
13 years ago
For those Spanish (and not only) folks, that want their national letters back after htmlentities :)
<?php
protected function
_decodeAccented
(
$encodedValue
,
$options
= array()) {
$options
+= array(
'quote'
=>
ENT_NOQUOTES
,
'encoding'
=>
'UTF-8'
,
);
return
preg_replace_callback
(
'/&\w(acute|uml|tilde);/'
,
create_function
(
'$m'
,
'return html_entity_decode($m[0], '
.
$options
[
'quote'
] .
', "'
.
$options
[
'encoding'
] .
'");'
),
$encodedValue
);
}
?>
wd at NOSPAMwd dot it
¶
13 years ago
Hi there,
after several and several tests, I figured out that dot:
- htmlentities() function remove characters like "à","è",etc when you specify a flag and a charset
- htmlentities() function DOES NOT remove characters like those above when you DO NOT specify anything
So, let's assume that..
<?php
$str
=
"Hèèèllooo"
;
$res_1
=
htmlentities
(
$str
,
ENT_QUOTES
,
"UTF-8"
);
$res_2
=
htmlentities
(
$str
);
echo
var_dump
(
$res_1
);
echo
var_dump
(
$res_2
);
?>
I used this for a textarea content for comments. Anyway, note that using the "$res_2" form the function will leave unconverted single/double quotes. At this point you should use str_replace() function to perform the characters but be careful because..
<?php
$str
=
"'Hèèèllooo'"
;
$res_2
=
str_replace
(
"'"
,
"'"
,
$str
);
$res_2
=
htmlentities
(
$str
);
echo
var_dump
(
$res_2
);
$res_3
=
htmlentities
(
$str
);
$res_3
=
str_replace
(
"'"
,
"'"
,
$res_3
);
echo
var_dump
(
$res_3
);
?>
Hope it will helps you.
Regards,
W.D.
n at erui dot eu
¶
13 years ago
html entities does not encode all unicode characters. It encodes what it can [all of latin1], and the others slip through. Љ is the nasty I use. I have searched for a function which encodes everything, but in the end I wrote this. This is as simple as I can get it. Consult an ansii table to custom include/omit chars you want/don't. I'm sure it's not that fast.
// Unicode-proof htmlentities.
// Returns 'normal' chars as chars and weirdos as numeric html entites.
function superentities( $str ){
// get rid of existing entities else double-escape
$str = html_entity_decode(stripslashes($str),ENT_QUOTES,'UTF-8');
$ar = preg_split('/(?<!^)(?!$)/u', $str ); // return array of every multi-byte character
foreach ($ar as $c){
$o = ord($c);
if ( (strlen($c) > 1) || /* multi-byte [unicode] */
($o <32 || $o > 126) || /* <- control / latin weirdos -> */
($o >33 && $o < 40) ||/* quotes + ambersand */
($o >59 && $o < 63) /* html */
) {
// convert to numeric entity
$c = mb_encode_numericentity($c,array (0x0, 0xffff, 0, 0xffff), 'UTF-8');
}
$str2 .= $c;
}
return $str2;
}
robin at robinwinslow dot co dot uk
¶
14 years ago
htmlentities seems to have changed at some point between version 5.1.6 and 5.3.3, such that it now returns an empty string for anything containing a pound sign:
$ php -v
PHP 5.1.6 (cli) (built: May 22 2008 09:08:44)
$ php -r "echo htmlentities('£hello', null, 'utf-8');"
£hello
$
$ php -v
PHP 5.3.3 (cli) (built: Aug 19 2010 12:07:49)
$ php -r "echo htmlentities('£hello', null, 'utf-8');"
$
(Returns an empty string the second time)
Just a heads up.
admin at wapforum dot rs
¶
14 years ago
A useful little function to convert the symbols in the different inputs.
<?php
function
ConvertSimbols
(
$var
,
$ConvertQuotes
=
0
) {
if (
$ConvertQuotes
>
0
) {
$var
=
htmlentities
(
$var
,
ENT_NOQUOTES
,
'UTF-8'
);
$var
=
str_replace
(
'\"'
,
''
,
$var
);
$var
=
str_replace
(
"\'"
,
''
,
$var
);
} else {
$var
=
htmlentities
(
$var
,
ENT_QUOTES
,
'UTF-8'
);
}
return
$var
;
}
?>
Usage with quotes for example message:
$message = ConvertSimbols($message);
Usage without quotes for example link:
$link = ConvertSimbols($link, 1);
Jeff
¶
7 years ago
There is a feature when writing to XML using an AJAX call to PHP that rarely is mentioned. I struggled for many hours using htmlentities() because what was getting written to my XML document was not as expected. I naturally assumed that I should be converting my strings before writing them to XML to adhere to XML rules on illegal characters. To my surprise, when converting with htmlentities() or htmlspecialchars() and then writing to an XML file, the resulting ampersands get converted afterwards! Consider the following example:
<?php
$str
=
"<b>I am cool</b>"
;
$str
=
htmlentities
(
$str
) ;
?>
When you append $str to an XML element and save() the document, you would expect the XML document's source code to look something like this:
<ele><b>I am cool</b></ele>
But that is not what happens. The resulting ampersands get converted by PHP automatically to & and your source code ends up looking like this:
<ele>&lt;b&gt;I am cool&lt;/b&gt;</ele>
As you can see, this creates problems when trying to output the XML data back to HTML. It is important to remember that when writing to XML this way, special characters like ">" and "<"; PHP converts them automatically and there becomes no need to use htmlentities() in certain cases. I assume this feature is in place to aid with passing data through header queries, to avoid reserved characters conflicting with others in a header query (e.g. & or =). Now I understand this may not be the case with older versions of PHP and that this might be a feature of my version (PHP version 5.6.32). With older versions, I assume using htmlentities() or htmlspecialchars() is a must, as stated with previous notes here. Also I use the charset UTF-8 in my HTML and XML and am not sure if this also effects the results I get.
Anyway, I struggled for many hours with using htmlentities() to convert strings for XML writing and saving, when all I had to do was simply not use the function and let PHP convert my strings for me. I hope this helps because I would think I am not the only one who has struggled with this situation.
Tom Walter
¶
16 years ago
Note that as of 5.2.5 it appears that if the input string contains a character that is not valid for the output encoding you've specified, then this function returns null.
You might expect it to just strip the invalid char, but it doesn't.
You can strip the chars yourself like so:
iconv('utf-8','utf-8',$str);
You can combine that with htmlentities also:
$str = htmlentities(iconv('UTF-8', 'UTF-8//IGNORE', $str, ENT_QUOTES, 'UTF-8');
Should give you a string with htmlentities encoded to utf-8, and any unsupported chars stripped.
steve at mcdragonsoftware dot com
¶
13 years ago
I'm glad 5.4 has xml support, but many of us are working with older installations, some of us still have to use PHP4. If you're like me you've been frustrated with trying to use htmlentites/htmlspecial chars with xml output. I was hoping to find an option to force numeric encoding, lacking that, I have written my own xmlencode function, which I now offer:
usage:
$string xmlencode( $string )
it will use htmlspecialchars for the valid xml entities amp, quote, lt, gt, (apos) and return the numeric entity for all other non alpha-numeric characters.
-------------------------------------------
<?php
if( !
function_exists
(
'xmlentities'
) ) {
function
xmlentities
(
$string
) {
$not_in_list
=
"A-Z0-9a-z\s_-"
;
return
preg_replace_callback
(
"/[^
{
$not_in_list
}
]/"
,
'get_xml_entity_at_index_0'
,
$string
);
}
function
get_xml_entity_at_index_0
(
$CHAR
) {
if( !
is_string
(
$CHAR
[
0
] ) || (
strlen
(
$CHAR
[
0
] ) >
1
) ) {
die(
"function: 'get_xml_entity_at_index_0' requires data type: 'char' (single character). '
{
$CHAR
[
0
]}
' does not match this type."
);
}
switch(
$CHAR
[
0
] ) {
case
"'"
: case
'"'
: case
'&'
: case
'<'
: case
'>'
:
return
htmlspecialchars
(
$CHAR
[
0
],
ENT_QUOTES
); break;
default:
return
numeric_entity_4_char
(
$CHAR
[
0
]); break;
}
}
function
numeric_entity_4_char
(
$char
) {
return
"&#"
.
str_pad
(
ord
(
$char
),
3
,
'0'
,
STR_PAD_LEFT
).
";"
;
}
}
?>
jake_mcmahon at hotmail dot com
¶
21 years ago
This fuction is particularly useful against XSS (cross-site-scripting-). XSS makes use of holes in code, whether it be in Javascript or PHP. XSS often, if not always, uses HTML entities to do its evil deeds, so this function in co-operation with your scripts (particularly search or submitting scripts) is a very useful tool in combatting "H4X0rz".
h_guillaume at hotmail dot com
¶
14 years ago
I use this function to encode all the xml entities and also all the &something; that are not defined in xml like ™
You can also decode what you encode with my decode function.
My function works a little like the htmlentities.
You can also add other string to the array if you want to exclude them from the encoding.
<?php
function
xml_entity_decode
(
$text
,
$charset
=
'Windows-1252'
){
$text
=
html_entity_decode
(
$text
,
ENT_COMPAT
,
$charset
);
$text
=
html_entity_decode
(
$text
,
ENT_COMPAT
,
$charset
);
return
$text
;
}
function
xml_entities
(
$text
,
$charset
=
'Windows-1252'
){
$text
=
htmlentities
(
$text
,
ENT_COMPAT
,
$charset
,
false
);
$arr_xml_special_char
= array(
"""
,
"&"
,
"'"
,
"<"
,
">"
);
$arr_xml_special_char_regex
=
"(?"
;
foreach(
$arr_xml_special_char
as
$key
=>
$value
){
$arr_xml_special_char_regex
.=
"(?!
$value
)"
;
}
$arr_xml_special_char_regex
.=
")"
;
$pattern
=
"/
$arr_xml_special_char_regex
&([a-zA-Z0-9]+;)/"
;
$replacement
=
'&${1}'
;
return
preg_replace
(
$pattern
,
$replacement
,
$text
);
}
?>
za at byza dot it
¶
17 years ago
Trouble when using files with different charset?
htmlentities and html_entity_decode can be used to translate between charset!
Sample function:
<?php
function
utf2latin
(
$text
) {
$text
=
htmlentities
(
$text
,
ENT_COMPAT
,
'UTF-8'
);
return
html_entity_decode
(
$text
,
ENT_COMPAT
,
'ISO-8859-1'
);
}
?>
drallen at cs dot uwaterloo dot ca
¶
14 years ago
A pointer to
http://www.php.net/manual/en/function.mb-convert-encoding.php
if your intention is to translate *all* characters in a charset to their corresponding HTML entities, not just named characters. Non-named characters will be replaced with HTML numeric encoding. eg:
$text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");
