使用 PHP 从 XML 文件中重新调整多个动态结果的 XPATH 方法 [英] XPATH method for retuning multiple dynamic results from a XML file using PHP

问题描述

我有一个表单，用户输入或选择一个值，表单如下

I have a form that the user types or selects a value the form is as follows

<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">

然后search_photo.php脚本捕获表单的结果并过滤用户输入的值，如下

Then the search_photo.php script that catches the result of the form and filters the values entered by the user as follows

$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);

如果所有设置的都是 'photographer_id'，则第一次 XPATH 传递的 $result 是正确的，如果我再尝试 $result = $xml->xpath('/root/area[photographer_id="' . $photographer_id . '"] |/root/area[photographer="' . $photographer . '"]'); 并选择 1 和 fred 然后我得到一个所有四个数组的结果，当它应该是一个空数组时，可以建议如何纠正这个错误.抱歉，这里是 XML 文件

The $result from the first XPATH pass is correct if all that is set is ‘photographer_id’ if I then try $result = $xml->xpath('/root/area[photographer_id="' . $photographer_id . '"] | /root/area[photographer="' . $photographer . '"]'); and select 1 and fred then I get the result of an array of all four when it should be an empty array can advise how to correct this error. Sorry michi here is the XML file

 <?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>

这有帮助吗，不过最终的 XML 文件会比这个大.

does this help, the final XML file will be larger than this though.

推荐答案

有一个类似的问题，脚本很长，我从那里得到了这个想法并提出了这个我希望它有帮助

Hi had a simillar problem with a long in script, I have taken the idea from there and came up with this i hope it helps

<?php

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

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

for ($i = 0; $i

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"];
} 

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

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

}

//echo $photographer_id;
//echo $photographer;
//echo $image;

$filteredResult = array();

foreach($result as $obj){
    if(in_array($photographer, (array)$obj) == 1 || $photographer == 'x'){ 
        if(in_array($image, (array)$obj) || $image == 'x'){
            array_push($filteredResult, $obj);
        }
    }
}

foreach($filteredResult as &$obj){
    //how to access values in the object
    echo $obj->{'photographer'};
    echo $obj->{'image'};
}
echo $obj->{'image'};

    ?>

最后的回声应该给你一些提示

the last echo should give you some pointers

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