PHP export text into Excel can't see normal style as former

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function change_excel_br($str){
    $new_str ="";
    if($str){
	    $p_new_lines   = array("\r\n", "\n", "\r","\r\n", "
","
","
","
","
");  
		$p_change_line_in_excel_cell = '
';  
		$new_str = str_replace( $p_new_lines,$p_change_line_in_excel_cell,$str);  
	}
	return $new_str;
}