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@ 2019-03-21T00:57:29Z

<?php 
$xml = '<?xml version="1.0" encoding="utf-8"?>
<products>
  <item>
    <reference>00001</reference>
    <other_string>PRODUCT 1</other_string>
    <brand>BRAND 1</brand>
    <promo>YES</promo>
  </item>
  <item>
    <reference>00002</reference>
    <other_string>PRODUCT 2</other_string>
    <brand>BRAND 2</brand>
    <promo>YES</promo>
  </item>
  <item>
    <reference>00003</reference>
    <other_string>PRODUCT 3</other_string>
    <brand>BRAND 3</brand>
    <promo>NO</promo>
  </item>
  <item>
    <reference>00004</reference>
    <other_string>PRODUCT 4</other_string>
    <brand>BRAND 4</brand>
    <promo>NO</promo>
  </item>
  <item>
    <reference>00005</reference>
    <other_string>PRODUCT 5</other_string>
    <brand>BRAND 5</brand>
    <promo>YES</promo>
  </item>
</products>';
$doc = new DOMDocument();
$doc->loadXML($xml);
foreach ($doc->getElementsByTagName('promo') as $ele) {
    $newnode = $doc->createElement('newnode');
    $newnode->nodeValue = $ele->nodeValue == 'YES' ? 1 : 0;
    $ele->parentNode->appendChild($newnode);
}
echo $doc->saveXML();

Output for git.master, git.master_jit, rfc.property-hooks: <?xml version="1.0" encoding="utf-8"?> <products> <item> <reference>00001</reference> <other_string>PRODUCT 1</other_string> <brand>BRAND 1</brand> <promo>YES</promo> <newnode>1</newnode></item> <item> <reference>00002</reference> <other_string>PRODUCT 2</other_string> <brand>BRAND 2</brand> <promo>YES</promo> <newnode>1</newnode></item> <item> <reference>00003</reference> <other_string>PRODUCT 3</other_string> <brand>BRAND 3</brand> <promo>NO</promo> <newnode>0</newnode></item> <item> <reference>00004</reference> <other_string>PRODUCT 4</other_string> <brand>BRAND 4</brand> <promo>NO</promo> <newnode>0</newnode></item> <item> <reference>00005</reference> <other_string>PRODUCT 5</other_string> <brand>BRAND 5</brand> <promo>YES</promo> <newnode>1</newnode></item> </products>

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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