PHP Function List

Sorry, but the function simplexml-element-registerxpathnamespace is not in the online manual. Perhaps you misspelled it, or it is a relatively new function that hasn't made it into the online documentation yet. The following are the 20 functions which seem to be closest in spelling to simplexml-element-registerxpathnamespace (really good matches are in bold). Perhaps you were looking for one of these:

simplexmlelement
implementsinterface
simplexmliterator
domnode_set_namespace
domelement_tagname
xml_set_start_namespace_decl_handler
simplexml_load_string

sdo_model_type_getnamespaceuri
xmlrpc_server_register_method
innamespace
imagick_getpixelregioniterator
getnamespacename
mb_eregi_replace
domdocument_get_elements_by_tagname

domnode_add_namespace
libxml_set_streams_context
imagick_setimagecolorspace
xmlrpc_server_register_introspection_callback
domimplementation
xpath_register_ns

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For a quick overview over all documented PHP functions, click here.