문자열
addcslashes() treats NUL as a string terminator:
assert("any" === addcslashes("any\0body", "-"));
unless you order it backslashified:
assert("any\\000body" === addcslashes("any\0body", "\0"));
(Uncertain whether this should be declared a bug or simply that addcslashes() is not binary-safe, whatever that means.)
AddCSlashes
(PHP 4, PHP 5)
AddCSlashes — C 형식으로 문자열에 슬래쉬를 덧붙입니다.
설명
string addcslashes
( string $str
, string $charlist
)
charlist 인자에 주어진 문자 목록 앞에 백슬래쉬를 추가한 문자열을 반환합니다. C 형식으로 \n, \r 등을 이스케이프하고, 32보다 작거나 126보다 큰 ASCII 코드는 팔진 표현으로 변환합니다.
0, a, b, f, n, r, t, v를 이스케이프할 때 주의하십시오. 이는 \0, \a, \b, \f, \n, \r, \t, \v로 변환됩니다. C에서는 이 모든 것이 예약 정의된 이스케이프 시퀀스지만, PHP에서는 \0 (NULL), \r (캐리지 리턴), \n (뉴라인), \t (탭)만이 예약 정의된 이스케이프 시퀀스입니다.
charlist 을 "\0..\37"처럼 하면, 0에서 37사이의 모든 ASCII코드를 이스케이프합니다.
Example#1 addcslashes() 예제
<?php
$escaped = addcslashes($not_escaped, "\0..\37!@\177..\377");
?>
charlist 인자에 문자 시퀀스를 정의할 때, 처음에서 끝 범위에 어떠한 문자가 들어가는지 확인하십시오.
<?php
echo addcslashes('foo[ ]', 'A..z');
// 출력: \f\o\o\[ \]
// 모든 대문자와 소문자를 이스케이프합니다.
// ... 하지만 [\]^_`와 탭, 라인 피드,
// 캐리지 리턴 등도 이스케이프합니다.
?>
echo addcslashes("zoo['.']", 'z..A');
// 출력: \zoo['\.']
?>
참고: stripcslashes(), stripslashes(), htmlspecialchars(), quotemeta().
add a note
User Contributed NotesAddCSlashes
stein at visibone dot com
12-Nov-2007 03:16
12-Nov-2007 03:16
Johannes
26-Oct-2007 05:34
26-Oct-2007 05:34
Be carefull with adding the \ to the list of encoded characters. When you add it at the last position it encodes all encoding slashes. I got a lot of \\\ by this mistake.
So always encode \ at first.
phpcoder at cyberpimp dot pimpdomain dot com
20-Jan-2005 12:35
20-Jan-2005 12:35
Forgot to add something:
The only time you would likely use addcslashes() without specifying the backslash (\) character in charlist is when you are VALIDATING (not encoding!) a data string.
(Validation ensures that all control characters and other unsafe characters are correctly encoded / escaped, but does not alter any pre-existing escape sequences.)
You can validate a data string multiple times without fear of "double encoding". A single decoding pass will return the original data, regardless of how many times it was validated.)
phpcoder at cyberpimp dot pimpdomain dot com
19-Jan-2005 11:02
19-Jan-2005 11:02
If you are using addcslashes() to encode text which is to later be decoded back to it's original form, you MUST specify the backslash (\) character in charlist!
Example:
<?php
$originaltext = 'This text does NOT contain \\n a new-line!';
$encoded = addcslashes($originaltext, '\\');
$decoded = stripcslashes($encoded);
//$decoded now contains a copy of $originaltext with perfect integrity
echo $decoded; //Display the sentence with it's literal \n intact
?>
If the '\\' was not specified in addcslashes(), any literal \n (or other C-style special character) sequences in $originaltext would pass through un-encoded, but then be decoded into control characters by stripcslashes() and the data would lose it's integrity through the encode-decode transaction.
ruben at intesys dot it
31-May-2004 09:51
31-May-2004 09:51
jsAddSlashes for XHTML documents:
<?php
header("Content-type: text/xml");
print <<<EOF
<?xml version="1.0"?>
<html>
<head>
<script type="text/javascript">
EOF;
function jsAddSlashes($str) {
$pattern = array(
"/\\\\/" , "/\n/" , "/\r/" , "/\"/" ,
"/\'/" , "/&/" , "/</" , "/>/"
);
$replace = array(
"\\\\\\\\", "\\n" , "\\r" , "\\\"" ,
"\\'" , "\\x26" , "\\x3C" , "\\x3E"
);
return preg_replace($pattern, $replace, $str);
}
$message = jsAddSlashes("\"<Hello>\",\r\n'&World'\\!");
print <<<EOF
alert("$message");
</script>
</head>
<body>
<h1>Hello, World!</h1>
</body>
</html>
EOF;
?>
21-Sep-2003 11:44
<?
function jsaddslashes($s)
{
$o="";
$l=strlen($s);
for($i=0;$i<$l;$i++)
{
$c=$s[$i];
switch($c)
{
case '<': $o.='\\x3C'; break;
case '>': $o.='\\x3E'; break;
case '\'': $o.='\\\''; break;
case '\\': $o.='\\\\'; break;
case '"': $o.='\\"'; break;
case "\n": $o.='\\n'; break;
case "\r": $o.='\\r'; break;
default:
$o.=$c;
}
}
return $o;
}
?>
<script language="javascript">
document.write("<? echo jsaddslashes('<h1 style="color:red">hello</h1>'); ?>");
</script>
output :
<script language="javascript">
document.write("\x3Ch1 style=\"color:red\"\x3Ehello\x3C/h1\x3E");
</script>
natNOSPAM at noworrie dot NO_SPAM dot com
17-May-2002 04:22
17-May-2002 04:22
I have found the following to be much more appropriate code example:
<?php
$escaped = addcslashes($not_escaped, "\0..\37!@\@\177..\377");
?>
This will protect original, innocent backslashes from stripcslashes.