Error al buscar en WordPress con preg_split

Warning: preg_split() expects parameter 2 to be string, object given in /home/baraderote/domains/baraderoteinforma.com.ar/public_html/wp-includes/formatting.php on line 70

Warning: Invalid argument supplied for foreach() in /home/baraderote/domains/baraderoteinforma.com.ar/public_html/wp-includes/formatting.php on line 72

Warning: implode() [function.implode]: Invalid arguments passed in /home/baraderote/domains/baraderoteinforma.com.ar/public_html/wp-includes/formatting.php on line 90

$textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE);

	foreach ( $textarr as &$curl ) {
		if ( empty( $curl ) )
			continue;

		// Only call _wptexturize_pushpop_element if first char is correct tag opening
		$first = $curl[0];
		if ( '<' === $first ) {
			_wptexturize_pushpop_element($curl, $no_texturize_tags_stack, $no_texturize_tags, '<', '>');
		} elseif ( '[' === $first ) {
			_wptexturize_pushpop_element($curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes, '[', ']');
		} elseif ( empty($no_texturize_shortcodes_stack) && empty($no_texturize_tags_stack) ) {
			// This is not a tag, nor is the texturization disabled static strings
			$curl = str_replace($static_characters, $static_replacements, $curl);
			// regular expressions
			$curl = preg_replace($dynamic_characters, $dynamic_replacements, $curl);
		}
		$curl = preg_replace('/&([^#])(?![a-zA-Z1-4]{1,8};)/', '&$1', $curl);
	}
	return implode( '', $textarr );