batch.php

<?php

class SimpleXMLExtended extends SimpleXMLElement
{
    public function addCData($cdata_text)
    {
        $node= dom_import_simplexml($this);
        $no = $node->ownerDocument;
        $node->appendChild($no->createCDATASection($cdata_text));
    }
}

//
//second_node 1つのみ
$pub_info = [
    'publisher' => "publisher",
    'publisherurl' => "https://publisherurl.com",
    'lastBuildDate' => gmdate("D, d M Y G:i:s T"),
    ];

//求人ノード
// <job> ~ </job>でくくる必要がある
$job_info = [
    'title'           => '',
    'date'            => '',
    'referencenumber' => '',
    'url'             => '',
    'company'         => '',
    'station'         => '',
    'city'            => '',
    'state'           => '',
    'country'         => '',
    'description'     => '',
    'salary'          => '',
    'jobtype'         => '',
    'category'        => ''
];

//Main
$job_count = 0;//job数
$root = '<?xml version="1.0" encoding="UTF-8" ?><source></source>';
$rootNode = new SimpleXMLExtended($root);

//publishNode作成
createPubNode($rootNode, $pub_info);

$job_ary [] = $job_info;
//jobNode作成
foreach($job_ary as $job) {
    createJobNode($rootNode, $job);
}

$xml = shapingXML($rootNode);
echo $xml;

/***
 * 関数群 
 */

function createPubNode(&$rootNode, $pub_info) {
    foreach($pub_info as $key=>$value) {
        $itemNode = $rootNode->addChild($key,_h($value));
    }
}

function createJobNode(&$rootNode, $job_info) {
    foreach($job_info as $key=>$value) {
        if(empty($value)) {
            continue;
        }
        $itemNode = $rootNode->addChild($key);
        $itemNode->addCData(_h($value));
    }
}
function shapingXML($xml) {
    $dom = new DOMDocument('1.0', 'utf-8');
    $dom->loadXML($xml->asXML());
    $dom->preserveWhiteSpace = false;
    $dom->formatOutput = true;
    return  $dom->saveXML();
}

/**
 * エスケープ処理
 * XMLの値の中に&が入ってるとエラーで落ちるので
 */
function _h($value)
{
    return htmlspecialchars($value, ENT_QUOTES);
}

?>