Error: Array to string conversion in mf2

[edent]

The function compare_urls() uses array_intersect() :

wordpress-webmention/includes/Handler/class-mf2.php

Lines 574 to 594 in 0259d51

	public function compare_urls( $needle, $haystack, $schemeless = true ) {
	if ( ! $this->is_url( $needle ) ) {
	return false;
	}
	if ( is_array( reset( $haystack ) ) ) {
	return false;
	}
	if ( true === $schemeless ) {
	// Remove url-scheme.
	$schemeless_target = preg_replace( '/^https?:\/\//i', '', $needle );
	// Add both urls to the needle.
	$needle = array( 'http://' . $schemeless_target, 'https://' . $schemeless_target );
	} else {
	// Make $needle an array.
	$needle = array( $needle );
	}
	// Compare both arrays.
	return array_intersect( $needle, $haystack );
	}

The intersect requires both variables to be one-dimensional arrays. But, sometimes, this isn't the case.

I received a $needle of:

array (
  0 => 'http://shkspr.mobi/blog/2024/07/llms-are-good-for-coding-because-your-documentation-is-shit/',
  1 => 'https://shkspr.mobi/blog/2024/07/llms-are-good-for-coding-because-your-documentation-is-shit/',
)

But the $haystack was:

array (
  0 => 'githubcopilot',
  1 => 'https://brid.gy/comment/mastodon/@edent@mastodon.social/112773307021860322/githubcopilot',
  2 => 
  array (
    'type' => 
    array (
      0 => 'h-card',
    ),
    'properties' => 
    array (
      'uid' => 
      array (
        0 => 'tag:mastodon.social,2013:7112',
      ),
      'name' => 
      array (
        0 => 'Edent',
      ),
      'url' => 
      array (
        0 => 'https://mastodon.social/@Edent',
      ),
    ),
    'value' => 'https://mastodon.social/@Edent',
  ),
)

Because the 2nd element is an array, an error is thrown Array to string conversion.

Is there a way to ensure the $haystack is a simple array?