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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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urlencode

(PHP 3, PHP 4, PHP 5)

urlencode -- URL-encodes string

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.

Parameters

str

The string to be encoded.

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 1738 encoding (see rawurlencode()) in that for historical reasons, spaces are encoded as plus (+) signs.

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) . '">';
?>

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 &amp; 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().

See Also

urldecode()
htmlentities()
rawurlencode()
rawurldecode()

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Another Useful functions:


function.urlencode | function.rawurlencode |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.