JsonPath

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 get("$..book[?(@.isbn)].category");
   $res1 = $store->get("$..book");
   $res2=$store->get('$.store.book[*]');
  
    //$res = $store->get("$..book[?(@.isbn)].category", true); // You can set true to get only unique results
    var_dump($res2[0]['title']);  

XPath	JSONPath	Result
/store/book/author	$.store.book[*].author	the authors of all books in the store
//author	$..author	all authors
/store/*	$.store.*	all things in store, which are some books and a red bicycle.
/store//price	$.store..price	the price of everything in the store.
//book[3]	$..book[2]	the third book
//book[last()]	$..book[(@.length-1)] $..book[-1:]	the last book in order.
//book[position()<3]	$..book[0,1] $..book[:2]	the first two books
//book[isbn]	$..book[?(@.isbn)]	filter all books with isbn number
//book[price<10]	$..book[?(@.price<10)]	filter all books cheapier than 10
//*	$..*	all Elements in XML document. All members of JSON structure.

参考