[Tickets #3103] NEW: cannot setup horde with PHP-5.1.1 / Zend optimizer 2.60

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Ticket URL: http://bugs.horde.org/ticket/?id=3103
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 Ticket             | 3103
 Created By         | bbghost at gmail.com
 Summary            | cannot setup horde with PHP-5.1.1 / Zend optimizer 2.60
 Queue              | Horde Project Systems
 State              | Unconfirmed
 Priority           | 3. High
 Type               | Bug
 Owners             | 
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bbghost at gmail.com (2005-12-07 14:57) wrote:

whil follow the INSTALL step and go to Admin -> Setup,  All the config fail
to run and display the message that :

Notice: Only variable references should be returned by reference in
/home/mail/horde/lib/Horde/Variables.php on line 34

Fatal error: Cannot clone object of class DOMDocument due to
'zend.ze1_compatibility_mode' in /home/mail/horde/lib/Horde/Config.php on
line 1251

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And more, some message :

Notice: Only variable references should be returned by reference in
/home/mail/horde/lib/Horde/Tree.php on line 162

Notice: Only variable references should be returned by reference in
/home/mail/horde/lib/Horde/Block/Collection.php on line 127

Display in the left menu

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Is it a bug??How to fixed it ?? It also appears in PHP-5.0.5 & Zend - 2.5.7