Try following example to understand the conditional operator. Copy and paste following PHP program in test.php file ando keep it in your PHP Server's document root and browse it using any browser.
<html>
<head><title>Arithmetical Operators</title><head>
<body>
<?php
$a = 10;
$b = 20;
/* If condition is true then assign a to result otheriwse b */
$result = ($a > $b ) ? $a :$b;
echo "TEST1 : Value of result is $result<br/>";
/* If condition is true then assign a to result otheriwse b */
$result = ($a < $b ) ? $a :$b;
echo "TEST2 : Value of result is $result<br/>";
?>
</body>
</html>
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This will produce following result
TEST1 : Value of result is 20
TEST2 : Value of result is 10
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