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run code in 500+ PHP versions simultaneously

@ 2019-03-12T08:03:03Z

<?php

$allowed = array("img", "p","style");
$text='<img src="image.gif" onerror="myFunction()" style="background:red" onclick="myFunction()">

<p>A function is triggered if an error occurs when loading the image. The function shows an alert box with a text.
In this example we refer to an image that does not exist, therefore the onerror event occurs.</p>

<div>a sample div with a <span>span in it</span></div>
<p>a sample para with a <span>span in it</span></p>
<script>
function myFunction() {
  alert(\'The image could not be loaded.\');
}
</script>';

$doc = new DOMDocument();
$doc->loadHTML($text);
$xp = new DOMXPath($doc);
$find = '//body//*[not(name() = "'.implode ('" or name() = "', $allowed ).
    '")]';
echo "XPath = ".$find.PHP_EOL;
$toRemove = $xp->evaluate($find);
print_r($toRemove);
foreach ( $toRemove as $remove )    {
    $remove->parentNode->removeChild($remove);
}

// recreate HTML
$outHTML = "";
foreach ( $doc->getElementsByTagName("body")[0]->childNodes as $tag )  {
    $outHTML.= $doc->saveHTML($tag);
}
echo $outHTML;

Output for git.master, git.master_jit, rfc.property-hooks: XPath = //body//*[not(name() = "img" or name() = "p" or name() = "style")] DOMNodeList Object ( [length] => 4 ) <img src="image.gif" onerror="myFunction()" style="background:red" onclick="myFunction()"><p>A function is triggered if an error occurs when loading the image. The function shows an alert box with a text. In this example we refer to an image that does not exist, therefore the onerror event occurs.</p> <p>a sample para with a </p>

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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