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@ 2013-06-27T08:52:56Z

<?php
/**
 * What is the DOM Core Version is Supported by PHP DOM?
 */    
$dom = new DOMDocument();
$dom->loadXML('<root/>');

$element = $dom->documentElement;

function dom_list_feature(DOMDocument $dom, $feature, array $versions)
{
    echo "$feature Feature is in PHP DOMDocument implementation:\n\n";

    $found = [];


    foreach ($versions as $i => $version)
    {
        $result = $dom->implementation->hasFeature($feature, $version);
        if ($result) {
            $found[] = $version;
        }
        printf("    %d.) $feature %' -5s: %s\n", $i + 1, var_export($version, true), $result ? 'TRUE' : 'FALSE');
    }


    $formatter = new NumberFormatter('en_UK', NumberFormatter::SPELLOUT);
    $count = ucfirst($formatter->format($found));
    printf("\n%s %s versions found%s.\n\n", $count, $feature, $found ? ': ' . implode('; ', $found) : '');
}

# Test DOMDocument in PHP Support for DOM-Core Feature
# Document Object Model (DOM) <http://www.w3.org/DOM/DOMTR>
dom_list_feature($dom, "Core", ['3.0', '2.0', '1.0', '', NULL]);

# Test DOMDocument in PHP Support for DOM-XPath Feature
# Document Object Model XPath <http://www.w3.org/TR/DOM-Level-3-XPath/xpath.html>
dom_list_feature($dom, "XPath", ['3.0', '2.0', '1.0', '', NULL]);

Output for git.master, git.master_jit, rfc.property-hooks: Core Feature is in PHP DOMDocument implementation: 1.) Core '3.0': FALSE 2.) Core '2.0': FALSE 3.) Core '1.0': TRUE 4.) Core '' : FALSE Deprecated: DOMImplementation::hasFeature(): Passing null to parameter #2 ($version) of type string is deprecated in /in/i43s6 on line 19 5.) Core NULL : FALSE Fatal error: Uncaught TypeError: NumberFormatter::format(): Argument #1 ($num) must be of type int|float, array given in /in/i43s6:28 Stack trace: #0 /in/i43s6(28): NumberFormatter->format(Array) #1 /in/i43s6(34): dom_list_feature(Object(DOMDocument), 'Core', Array) #2 {main} thrown in /in/i43s6 on line 28
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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