(PHP 5 >= 5.2.0, PHP 7)
DOMNode::C14N — Canonicalize nodes to a string
public DOMNode::C14N ([ bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] ) : string|false
Canonicalize nodes to a string
exclusive
Enable exclusive parsing of only the nodes matched by the provided xpath or namespace prefixes.
with_comments
Retain comments in output.
xpath
An array of xpaths to filter the nodes by.
ns_prefixes
An array of namespace prefixes to filter the nodes by.
Returns canonicalized nodes as a string or false on failure
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https://www.php.net/manual/en/domnode.c14n.php