Mam formularz, który użytkownik wpisuje lub wybiera wartość, formularz jest następujący

<form id="search_photos" action="photo_result.php" method="get">
<select name="Photographer_id" id="Photographer_id"   style="height:23px; border:1px solid Silver;">
    <option selected="selected" value="x">Any Photographer_id</option>
    <option value="John">John</option>
    <option value="Fred">Fred</option>
    <option value="Joseph">Joseph</option>
</select>
<select name="Photographer_id" id="Photographer_id"   style="height:23px; border:1px solid Silver;">
    <option selected="selected" value="x">Any Photographer_id</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
</select>
<select name="images" id="images"   style="height:23px; border:1px solid Silver;">
    <option selected="selected" value="x">All Images</option>
    <option value="0">None</option>
    <option value="a">Image a</option>
    <option value="b">Image b </option>
    <option value="c">Image c </option>
</select>
    <select name="images_id" id="images_id"   style="height:23px; border:1px solid Silver;">
    <option selected="selected" value="x">All Images</option>
    <option value="0">None</option>
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
</select>
<input name="Submit" value="Search Now &gt;" id="Submit" class="Adv1_Filter_Button" type="submit">

A późniejsearch_photo.php skrypt, który przechwytuje wynik formularza i filtruje wartości wprowadzone przez użytkownika w następujący sposób

$xml = simplexml_load_file("photo.xml");

for ($i = 0; $i < count($xml); $i++) {  

    if (isset($_GET["LocationName"])) {
        $photographer_id = $_GET["LocationName"];
    }

    $result = $xml->xpath('/root/area[photographer_id="' . $photographer_id . '"]  ');
}

if(isset($_GET["Photographer"])) {
    $photographer = $_GET["Photographer"];
} 

$result = $xml->xpath('/root/area[photographer_id="' . $photographer_id . '"]  ');

if(isset($_GET["images"])) {
    $image = $_GET["images"];
}

echo $photographer_id;
echo $photographer;
echo $image;
var_dump ($result);

The$result od pierwszego podania XPATH jest poprawne, jeśli wszystko, co jest ustawione, to „photographer_id”, jeśli spróbuję$result = $xml->xpath('/root/area[photographer_id="' . $photographer_id . '"] | /root/area[photographer="' . $photographer . '"]'); i wybierz1 ifred wtedy otrzymuję wynik tablicy wszystkich czterech, gdy powinna to być pusta tablica, która może doradzić, jak poprawić ten błąd. Przepraszamy michi tutaj jest plik XML

 <?xml version="1.0" encoding="UTF-8"?>
  <root>
   <area>
    <photographer_id>1</photographer_id>
    <photographer>John</photographer>
    <image>a</image>
    <image_id>1</image_id>
   </area>
   <area>
    <photographer_id>1</photographer_id>
    <photographer>John</photographer>
    <image>b</image>
    <image_id>2</image_id>
   </area>
   <area>
    <photographer_id>1</photographer_id>
    <photographer>John</photographer>
    <image>c</image>
    <image_id>3</image_id>
   </area>
   <area>
    <photographer_id>2</photographer_id>
    <photographer>Fred</photographer>
    <image>a</image>
    <image_id>4</image_id>
   </area>
   <area>
    <photographer_id>3</photographer_id>
    <photographer>Joseph</photographer>
    <image>a</image>
    <image_id>5</image_id>
   </area>
  </root>

robi to, ale ostateczny plik XML będzie większy niż ten.