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@ 2016-10-23T10:45:04Z

<?php

$xml = new \SimpleXMLElement('
    <blog-post>
        <dc:tag xmlns:dc="http://purl.org/dc/elements/1.1/"/>
    </blog-post>'
);
var_dump(isset($xml->tag));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

108.08 ms | 1572 KiB | 5 Q