urlencode

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最新推荐文章于 2022-08-13 15:59:11 发布

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本文详细介绍了PHP中的urlencode函数，用于URL编码字符串。文章解释了如何使用此函数来编码URL中的变量，并给出了具体的示例代码，同时对比了其与RFC 3986标准中的差异。

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urlencode

(PHP 4, PHP 5)

urlencode — URL-encodes string

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Description

string urlencode ( string $str )

This function is convenient when encoding a string to be used in a query part of a URL, as a convenient way to pass variables to the next page.

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Parameters

str

The string to be encoded.

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Return Values

Returns a string in which all non-alphanumeric characters except -_. have been replaced with a percent (%) sign followed by two hex digits and spaces encoded as plus (+) signs. It is encoded the same way that the posted data from a WWW form is encoded, that is the same way as in application/x-www-form-urlencoded media type. This differs from the » RFC 3986 encoding (see rawurlencode()) in that for historical reasons, spaces are encoded as plus (+) signs.

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Examples

Example #1 urlencode() example

<?php
 echo '<a href="mycgi?foo=', urlencode($userinput), '">';
 ?>

Example #2 urlencode() and htmlentities() example

<?php
 $query_string = 'foo=' . urlencode($foo) . '&bar=' . urlencode($bar);
 echo '<a href="mycgi?' . htmlentities($query_string) . '">';
 ?>

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Notes

Note:

Be careful about variables that may match HTML entities. Things like &amp, &copy and &pound are parsed by the browser and the actual entity is used instead of the desired variable name. This is an obvious hassle that the W3C has been telling people about for years. The reference is here: » http://www.w3.org/TR/html4/appendix/notes.html#h-B.2.2.

PHP supports changing the argument separator to the W3C-suggested semi-colon through the arg_separator .ini directive. Unfortunately most user agents do not send form data in this semi-colon separated format. A more portable way around this is to use & instead of & as the separator. You don't need to change PHP's arg_separator for this. Leave it as &, but simply encode your URLs using htmlentities() or htmlspecialchars().