试试下面的例子就明白了条件运算符。复制并粘贴到test.php文件，将下面的PHP程序保存它在PHP服务器的文档根目录，使用浏览器浏览。
<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>
这将产生以下结果
TEST1 : Value of result is 20 TEST2 : Value of result is 10
