Converting to ASCII HEX

From: Ashley M. Kirchner (ashley_at_pcraft.com)
Date: 11/28/03 

Date: Thu, 27 Nov 2003 18:51:20 -0700
To: php-general@lists.php.net

    How can I convert a string like this: "test & test" into
"test%20%26%20test" so I can then pass it to a script? Essentially
convert the spaces and & symbol to their ASCII HEX equivalent. 

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