Description:
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urlencode documentation:

Returns a string in which all non-alphanumeric characters except -_. have been replaced with a percent (%) sign followed by two hex digits 

--> AND SPACES ENCODES 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 RFC1738 encoding (see rawurlencode()) in that for historical reasons, 

--> SPACES ARE ENCODED AS PLUS (+) SIGNS. <--

...

Where is the difference?

Thank you,

Steffen

Reproduce code:
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http://www.php.net/manual/en/function.urlencode.php

Expected result:
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irrelevant

Actual result:
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see description