PHP - Concatenate if statement?

问题

I want to concatenate in the middle of an echo to write an if statement, is this possible? Here is what I have.

echo "<li class='".if ($_GET["p"] == "home") { echo "active"; }."'><a href='#'>Home</a>        </li>";

回答1:

Like this, using the ternary operator:

echo "<li class='". (($_GET["p"] == "home") ? "active" : "") . "'><a href='#'>Home</a>        </li>";  

回答2:

Do like this:

echo "<li class='".($_GET["p"] == "home" ? 'active' : '') ."'><a href='#'>Home</a>        </li>";

回答3:

echo "<li class='".(($_GET["p"] == "home") ? "active" : "")."'><a href='#'>Home</a>        </li>";

回答4:

Instead of messy inline concatenations, might I suggest getting cozy with printf()?

$format = '<li class="%s"><a href="#">Home</a>        </li>';
printf($format, ($_GET['p'] == 'home') ? 'active' : '');

来源：https://stackoverflow.com/questions/13572117/php-concatenate-if-statement