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HTML API: Reliably parse HTML in get_url_in_content() #9272

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HTML API: Reliably parse HTML in get_url_in_content() #9272

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12 changes: 8 additions & 4 deletions src/wp-includes/formatting.php
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Original file line number Diff line number Diff line change
Expand Up @@ -5978,16 +5978,20 @@ function wp_unslash( $value ) {
*
* @since 3.6.0
*
* @param string $content A string which might contain a URL.
* @return string|false The found URL.
* @param string $content A string which might contain an `A` element with a non-empty `href` attribute.
* @return string|false Database-escaped URL via {@see esc_url()} if found, otherwise `false`.
*/
function get_url_in_content( $content ) {
if ( empty( $content ) ) {
return false;
}

if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
return sanitize_url( $matches[2] );
$processor = new WP_HTML_Tag_Processor( $content );
while ( $processor->next_tag( 'A' ) ) {
$href = $processor->get_attribute( 'href' );
if ( is_string( $href ) && ! empty( $href ) ) {
return sanitize_url( $href );
}
}

return false;
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