php if then else statement syntax error somewhere [duplicate] - php

Question

This question already has answers here:
PHP parse/syntax errors; and how to solve them
(20 answers)
Closed 5 years ago.
So I am getting the following parse error when this file loads:
Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE),
expecting identifier (T_STRING) or variable (T_VARIABLE) or number
(T_NUM_STRING)
I have tried everything to work out why and I narrowed it down to the
href=\"start.php?id=<?php echo $res['id'] ?>\"
section of the code. I am sure I left out a ' or " but unsure where as it all makes sense to me. Can anyone with a keener eye see where I am going wrong? Thank you.
My code:
<td>
<?php if($res['ndaSent'] == "No") {
echo "<span class=\"buttonTestDisabled\"> Start Test</span>";}
else {
echo "<a class=\"buttonTest\" href=\"start.php?id=<?php echo $res['id'] ?>\">Start Test</a> ";}
?>
</td>

Answer 1

echo "<a class=\"buttonTest\" href=\"start.php?id=<?php echo $res['id'] ?>\">Start Test</a> ";
}
Is incorrect, you are closing the PHP code before you are done with the PHP code. And $res['id'] cannot be in your echo like that, you should interpolate the variable correctly in the string. Remove the starting and closing tag inside the echo like this:
echo "<a class=\"buttonTest\" href=\"start.php?id={$res['id']}\">Start Test</a> ";
Please check this awesome guide on how to fix these kind of syntax errors.

Answer 2

You cant had snippet in echo use simple string concatenation
<td>
<?php if($res['ndaSent'] == "No") {
echo "<span class=\"buttonTestDisabled\"> Start Test</span>";}
else {
echo "<a class=\"buttonTest\" href=\"start.php?id=".$res['id']."\">Start Test</a> ";}
?>
</td>

Answer 3

Try this
echo "<a class=\"buttonTest\" href=\"start.php?id=" . $res['id'] . " \">Start Test</a> ";}