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I’m new to PHP and I just realized that XPath queries are NOT written in PHP… is that right and eventually what language should I study to master them ?
XML? Javascript?
XPath is its own language. This is a decent tutorial to get you started: http://zvon.org/comp/r/tut-XPath_1.html
Perhaps where your confusion comes in is that because XPath is one of the easiest ways of querying XML, many other languages have functions and methods that allow them to use it. As you may have discovered, PHP has Xpath related classes in both its DOM and SimpleXML libraries.