PHP解析错误：语法错误，意外'，'[关闭]

Question

Hi guys can anyone help to figure out what's wrong in my code it showing unexpected ','

    $list1 .= '<tr onmouseover="this.style.backgroundColor=','#ffff66',';" onmouseout="this.style.backgroundColor=','#d4e3e5',';">
    <td>'.$ver.'</td><td>'.$ver2.'</td>
</tr>'; 

Answer 1

, is used for passing multiple parameters to echo, not for concatenating strings to add to be stored in a variable. use . instead