urlencode
(PHP 4, PHP 5, PHP 7, PHP 8)
urlencode — 编码 URL 字符串
参数
string-
要编码的字符串。
返回值
返回字符串，此字符串中除了 -_.
之外的所有非字母数字字符都将被替换成百分号（%）后跟两位十六进制数，空格则编码为加号（+）。此编码与
WWW 表单 POST 数据的编码方式是一样的，同时与 application/x-www-form-urlencoded
的媒体类型编码方式一样。由于历史原因，此编码在将空格编码为加号（+）方面与
» RFC3986 编码（参见 rawurlencode()）不同。
示例
示例 #1 urlencode() 例子
<?php
$userinput = 'Data123!@-_ +';
echo "UserInput: $userinput\n";
echo '<a href="mycgi?foo=', urlencode($userinput), '">';
?>以上示例会输出：
UserInput: Data123!@-_ + <a href="mycgi?foo=Data123%21%40-_+%2B">
示例 #2 urlencode() 与 htmlentities() 例子
<?php
$foo = 'Data123!@-_ +';
$bar = "Not the same content as $foo";
echo "foo: $foo\n";
echo "bar: $bar\n";
$query_string = 'foo=' . urlencode($foo) . '&bar=' . urlencode($bar);
echo '<a href="mycgi?' . htmlentities($query_string) . '">';
?>以上示例会输出：
foo: Data123!@-_ + bar: Not the same content as Data123!@-_ + <a href="mycgi?foo=Data123%21%40-_+%2B&bar=Not+the+same+content+as+Data123%21%40-_+%2B">
注释
注意:
注意：小心与 HTML 实体相匹配的变量。像 &、© 和 £ 都将被浏览器解析，并使用实际实体替代所期待的变量名。这是明显的混乱，W3C 已经告诫人们好几年了。参考地址：» http://www.w3.org/TR/html4/appendix/notes.html#h-B.2.2。
PHP 通过 arg_separator.ini 指令，支持将参数分割符变成 W3C 所建议的分号。不幸的是大多数用户代理并不发送分号分隔符格式的表单数据。较为简单的解决办法是使用 & 代替 & 作为分隔符。你不需要为此修改 PHP 的 arg_separator。让它仍为 &，而仅使用 htmlentities() 或 htmlspecialchars() 对你的 URL 进行编码。
参见
- urldecode() - 解码已编码的 URL 字符串
- htmlentities() - 将字符转换为 HTML 转义字符
- rawurlencode() - 按照 RFC 3986 对 URL 进行编码
- rawurldecode() - 对已编码的 URL 字符串进行解码
- » RFC 3986
＋添加备注
用户贡献的备注 6 notes
davis dot peixoto at gmail dot com ¶
14 years ago
urlencode function and rawurlencode are mostly based on RFC 1738.
However, since 2005 the current RFC in use for URIs standard is RFC 3986.
Here is a function to encode URLs according to RFC 3986.
<?php
function myUrlEncode($string) {
$entities = array('%21', '%2A', '%27', '%28', '%29', '%3B', '%3A', '%40', '%26', '%3D', '%2B', '%24', '%2C', '%2F', '%3F', '%25', '%23', '%5B', '%5D');
$replacements = array('!', '*', "'", "(", ")", ";", ":", "@", "&", "=", "+", "$", ",", "/", "?", "%", "#", "[", "]");
return str_replace($entities, $replacements, urlencode($string));
}
?>
temu92 at gmail dot com ¶
15 years ago
I needed encoding and decoding for UTF8 urls, I came up with these very simple fuctions. Hope this helps!
<?php
function url_encode($string){
return urlencode(utf8_encode($string));
}
function url_decode($string){
return utf8_decode(urldecode($string));
}
?>
materialsmoke at gmail dot com ¶
1 year ago
this function will encode the URL while preserving the functionality of URL so you can copy and paste it in the browser
```
function urlEncode($url) {
$parsedUrl = parse_url($url);
$encodedScheme = urlencode($parsedUrl['scheme']);
$encodedHost = urlencode($parsedUrl['host']);
$encodedPath = implode('/', array_map('urlencode', explode('/', $parsedUrl['path'])));
if (isset($parsedUrl['query'])) {
$encodedQuery = '?' . urlencode($parsedUrl['query']);
} else {
$encodedQuery = '';
}
return "{$encodedScheme}://{$encodedHost}{$encodedPath}{$encodedQuery}";
}
```
daniel+php at danielnorton dot com ¶
15 years ago
Don't use urlencode() or urldecode() if the text includes an email address, as it destroys the "+" character, a perfectly valid email address character.
Unless you're certain that you won't be encoding email addresses AND you need the readability provided by the non-standard "+" usage, instead always use use rawurlencode() or rawurldecode().
omid at omidsakhi dot com ¶
15 years ago
I needed a function in PHP to do the same job as the complete escape function in Javascript. It took me some time not to find it. But findaly I decided to write my own code. So just to save time:
<?php
function fullescape($in)
{
$out = '';
for ($i=0;$i<strlen($in);$i++)
{
$hex = dechex(ord($in[$i]));
if ($hex=='')
$out = $out.urlencode($in[$i]);
else
$out = $out .'%'.((strlen($hex)==1) ? ('0'.strtoupper($hex)):(strtoupper($hex)));
}
$out = str_replace('+','%20',$out);
$out = str_replace('_','%5F',$out);
$out = str_replace('.','%2E',$out);
$out = str_replace('-','%2D',$out);
return $out;
}
?>
It can be fully decoded using the unscape function in Javascript.
ahrensberg at gmail dot com ¶
17 years ago
Like "Benjamin dot Bruno at web dot de" earlier has writen, you can have problems with encode strings with special characters to flash. Benjamin write that:
<?php
function flash_encode ($input)
{
return rawurlencode(utf8_encode($input));
}
?>
... could do the problem. Unfortunately flash still have problems with read some quotations, but with this one:
<?php
function flash_encode($string)
{
$string = rawurlencode(utf8_encode($string));
$string = str_replace("%C2%96", "-", $string);
$string = str_replace("%C2%91", "%27", $string);
$string = str_replace("%C2%92", "%27", $string);
$string = str_replace("%C2%82", "%27", $string);
$string = str_replace("%C2%93", "%22", $string);
$string = str_replace("%C2%94", "%22", $string);
$string = str_replace("%C2%84", "%22", $string);
$string = str_replace("%C2%8B", "%C2%AB", $string);
$string = str_replace("%C2%9B", "%C2%BB", $string);
return $string;
}
?>
... should solve this problem.