我该如何评估以下嵌套引号echo语句？

My problem is that I want $id to be evaluated and passed. I attempted to use escape quotes and failed. How can I do it properly?? if I put "" or '' I always get $id to be passed as a string $id

echo '<form name="aform" action=go.php?id=$id"  method="POST">'.

'';

Properly concatenate it to the string

echo '<form name="aform" action=go.php?id='.$id.'"  method="POST">';

You can also use curly braces as a quicker form of concatenation assuming you used double quotes instead of single:

echo "<form name='aform' action='go.php?id={$id}'  method='POST'>";

OR if you want double quotes to remain in your html you can escape them

echo "<form name=\"aform\" action=\"go.php?id={$id}\" method=\"POST\">";

Give this page a read: http://php.net/manual/en/language.operators.string.php