.

$row['NO'] = '<a href="javascript:void(0)"        onClick="openmywindow(\''.$row['bcd'].'\',\''.$row['gfh'].'\',\''.$row['test2'].'\',\''.$_REQUEST['test1'].'\')">'.$row['abc'].'</a>'

In the above statement, what is the meaning of escaping the values in that manner such as '\'. How can i learn this? In the above statement i want to replace the php variable $row['TEST2'] with a static value 'OPEN', but i am getting a syntax error.