Description:
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From manual page: http://www.php.net/function.sybase-set-message-handler#Description
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Each other sybase function use the "$link_identifier" to name the resource parameter. sybase_set_message_handler() is the only one that don't respects that kind of "convention"...
It is very insignificant but it could add uniformity through all sybase functions.

Expected result:
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bool sybase_set_message_handler ( callback $handler [, resource $link_identifier ] )

Actual result:
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bool sybase_set_message_handler ( callback $handler [, resource $connection ] )