Pass a string throudght on Click function - PHP : I am trying to pass a string in the onClick event handler function's arguments.

I am not able to pass the string to the function, but i am able to pass the number integer to the function. 

Please help me in this. Thanks in advance.

php : 

    echo '<tr style="background: #D6EAF8" class="clickable-row" OnClick="DisplayEnterOrderModal('.$order["id_order"].','.$order["id_customer"].','.$order[7].','"wanted to be passed"');"  value="'.$order["id_order"].'" > ';

error : 

    ( ! ) Parse error: syntax error, unexpected '"wanted to be passed"' (T_CONSTANT_ENCAPSED_STRING), expecting ',' or ';' in C:\wamp32\www\EK\index.php on line 644