file_get_contents() is only available in php >= 4.3.0, which is why you see this error.
http://www.php.net/file_get_contents
Moreover, eZpublish actually requires php 4.4, with the latest (4.4.4) being recommended. See the requirements section in the installation instructions:
Thanks for the help Mathew. I think I will have to install Apache, Mysql and PHP sepretlly, once I can't find any boundle with the ez Publish requirements.
Fátima
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