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insertBefore

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

This function inserts a new node right before the reference node

public function insertBefore<T as DOMNode>(
  DOMNode $newnode,
  DOMNode $refnode = NULL,
): T;

If you plan to do further modifications on the appended child you must use the returned node.

Parameters​

  • DOMNode$newnode - The new node.
  • DOMNode$refnode = NULL - The reference node. If not supplied, newnode is appended to the children.

Returns​

  • mixed - - The inserted node.