尝试获取wall xml相同的元素值，然后应用于其他xml

this is my general.xml file:-

<?xml version="1.0" encoding="UTF-8"?>
<results>
    <numFound>10</numFound>
    <QTime>4</QTime>
    <result>
        <distance>1071.59873299109</distance>
        <name>Irungattukottai</name>
    </result>
    <result>
            <distance>1892.33578431928</distance>
            <name>Valapuram</name>
       </result>
</results>

region.xml:-

<childrens>
    <child_5068 entity_id="5069" value="Irungattukottai" parent_id="4068"/>
    <child_5068 entity_id="7140" value="Valapuram" parent_id="4068"/>
</childrens>

product.xml:-

<products>
  <product_id value="1">
    <tab_id value="351">
      <tab_name value="test1"/>
      <dist_region value="5069"/>
      <dist_region value="5069"/>
      <dist_region value="5069"/>
    </tab_id>
  </product_id>
  <product_id value="2">
    <tab_id value="352">
      <tab_name value="test2"/>
      <dist_region value="4457"/>
      <dist_region value="7140"/>
      <dist_region value="5069"/>
    </tab_id>
  </product_id>
</products>

i have this three xml file i want to try something like this.
in general.xml file element <name>Irungattukottai</name>
if this name is exit in region.xml then get there entity_id
if entity_id is exit in product.xml then return there product_id element attribute value...

i am try this code:-

<?php
$g = file_get_contents('general.xml');
$r = file_get_contents('region.xml');
$p = file_get_contents('product.xml');

$general = simplexml_load_string($g);
$region = simplexml_load_string($r);
$product = simplexml_load_string($p);

$name = (string)$general->result->name;

if (strlen(trim($name))==0) exit('name not found');

list($entity) = $region->xpath("//*[@value='$name']/@entity_id");
$entity=(string)$entity;

if (strlen(trim($entity))==0) exit('entity_id not found');

list($prid) = $product->xpath("//dist_region[@value='$entity']/ancestor::product_id/@value");
$prid=(string)$prid;

echo "City Name:- $name, Entity_id:- $entity, Product_id:- $prid";
?>

this code is work perfact but only one value eg:-general.xml has two root in first <name>Irungattukottai</name> and in second root<name>Valapuram</name>
but my code is work only get first element not try to get wall xml file...

this is my corrent output:-

city Name:- Irungattukottai, Entity_id:- 5079, Product_id:- 1

but i want to this type of output:-

city Name:- Irungattukottai, Entity_id:- 5079, Product_id:- 1
city Name:- Valapuram , Entity_id:- 7140, Product_id:- 2

with use of above both answer its possible try this:-

  <?php
    foreach($general->result as $row){
    if(isset($row->name)){
    //create one variable and store in value.
    $name = $row->name;
     //all you code for region.xml and then for product.xml

    }
    echo "name:- $name,Entity:- $entity, product:- $prid"."<br>";
    }

?>

You need to iterate the array of $general.

Try to do :

echo '<pre>';
print_r($general);
echo '</pre>';

Check if you get an array with all the elements as in the xml file.

Your code to get general.xml feeds is ok.

You can get the name as

$name1 = (string)$general->result[0]->name;
$name2 = (string)$general->result[1]->name;
or you can use loop to get name one by one.

<?php
foreach($general->result as $row){
if(isset($row->name)){
  // do your logic here for region.xml and then for product.xml
}
}
?>

Try this:

$xml = simplexml_load_file( 'general.xml' );
$cities = $xml->xpath( '//result/name' );

$cityCount = count( $cities );
if( $cityCount ) {
    $region = simplexml_load_file( 'region.xml' );
    foreach( $cities as $city ) {
        $regions = $region->xpath( '//*[@value="'. ( string ) $city . '"]/@entity_id' );
        if( count ( $regions ) ) {
            $product = simplexml_load_file( 'products.xml' );
            $products = $product->xpath( '//dist_region[@value="' . ( string ) $regions[ 0 ][ 'entity_id' ] . '"]/ancestor::product_id/@value' );
            if( count( $products ) ) {
                foreach( $products as $p ) {
                    echo 'city Name:- ' . ( string ) $city . ', Entity_id:- ' . ( string ) $regions[ 0 ][ 'entity_id' ] . ', Product_id:- ' . $p[ 'value' ] . "
";
                }
            }
        }
    }
}

Output

city Name:- Irungattukottai, Entity_id:- 5069, Product_id:- 1
city Name:- Irungattukottai, Entity_id:- 5069, Product_id:- 2
city Name:- Valapuram, Entity_id:- 7140, Product_id:- 2