安装第一页出现的php notice

当我第一次进入x-space/install.php第一页时有这样的notice:
PHP Notice: Constant XML_ELEMENT_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_TEXT_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_CDATA_SECTION_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ENTITY_REF_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ENTITY_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_PI_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_COMMENT_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_DOCUMENT_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_DOCUMENT_TYPE_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_DOCUMENT_FRAG_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_NOTATION_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_HTML_DOCUMENT_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_DTD_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ELEMENT_DECL_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_DECL_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_ENTITY_DECL_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_NAMESPACE_DECL_NODE already defined in Unknown on line 0 PHP Notice: Constant XML_LOCAL_NAMESPACE already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_CDATA already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_ID already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_IDREF already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_IDREFS already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_ENTITY already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_NMTOKEN already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_NMTOKENS already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_ENUMERATION already defined in Unknown on line 0 PHP Notice: Constant XML_ATTRIBUTE_NOTATION already defined in Unknown on line 0

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