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run code in 300+ PHP versions simultaneously

@ 2018-10-02T12:38:00Z

<?php
$xml = new simplexmlelement('<pmc-articleset>
  <article xmlns:mml="http://www.w3.org/1998/Math/MathML" article-type="research-article">
    <!--...-->
    <front>
      <journal-meta>
        <journal-id journal-id-type="nlm-ta">Cell Death Differ</journal-id>
        <journal-id journal-id-type="iso-abbrev">Cell Death Differ</journal-id>
        <journal-title-group>
          <journal-title>Cell Death and Differentiation</journal-title>
        </journal-title-group>
        <issn pub-type="ppub">1350-9047</issn>
        <issn pub-type="epub">1476-5403</issn>
        <publisher>...</publisher>
      </journal-meta>
      <article-meta>...</article-meta>
    </front>
  </article>
</pmc-articleset>');
echo (string)$xml->article->front->{'journal-meta'}->{'journal-title-group'}->{'journal-title'};

Output for git.master, git.master_jit, rfc.property-hooks: Cell Death and Differentiation

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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