将变量放在已包含在数组中的图像URL中

i have the code

array( "name" => "Services Widget Description",
       "desc" => "Max 500 character(Use new line for new Point)",
       "std"=>"<ul>
                  <li>
             Rebum corrumliit neglegentur sit at,
           <img class='line22' width='243' height='2' alt='text line' src='images/text-line.jpg'>
        </li>
               </ul>"
),

URL is a variable which contains http://localhost/Junk , i want to use this variable inside src, i have tried like this

array( "name" => "Services Widget Description",
       "desc" => "Max 500 character(Use new line for new Point)",
       "std"=>"<ul>
                  <li>
             Rebum corrumliit neglegentur sit at,
           <img class='line22' width='243' height='2' alt='text line' src=URL.'images/text-line.jpg'>
        </li>
               </ul>"
),

but no use, please guide how to use it

URL is a CONSTANT not a variable.

Integrate URL in code ".URL."

array( "name" => "Services Widget Description",
       "desc" => "Max 500 character(Use new line for new Point)",
       "std"=>"<ul>
                  <li>
                      Rebum corrumliit neglegentur sit at,
                      <img class='line22' width='243' height='2' alt='text line' src='".URL."images/text-line.jpg'>
                  </li>
               </ul>"
),