PHP比较运算符示例

试试下面的例子就明白了比较运算符的用法。复制并粘贴下面内容到test.php文件，并将PHP程序保存在PHP服务器的文档根目录，并使用浏览器浏览。

<html>
<head><title>比较运算符</title><head>
<body>
<?php
    $a = 42;
    $b = 20;

    if( $a == $b ){
       echo "TEST1 : a is equal to b<br/>";
    }else{
       echo "TEST1 : a is not equal to b<br/>";
    }

    if( $a > $b ){
       echo "TEST2 : a is greater than  b<br/>";
    }else{
       echo "TEST2 : a is not greater than b<br/>";
    }
    if( $a < $b ){
       echo "TEST3 : a is less than  b<br/>";
    }else{
       echo "TEST3 : a is not less than b<br/>";
    }
    if( $a != $b ){
       echo "TEST4 : a is not equal to b<br/>";
    }else{
       echo "TEST4 : a is equal to b<br/>";
    }
    if( $a >= $b ){
       echo "TEST5 : a is either grater than or equal to b<br/>";
    }else{
       echo "TEST5 : a is nieghter greater than nor equal to b<br/>";
    }
    if( $a <= $b ){
       echo "TEST6 : a is either less than or equal to b<br/>";
    }else{
       echo "TEST6 : a is nieghter less than nor equal to b<br/>";
    }
?>
</body>
</html>

这将产生以下结果：

TEST1 : a is not equal to b
TEST2 : a is greater than b
TEST3 : a is not less than b
TEST4 : a is not equal to b
TEST5 : a is either grater than or equal to b
TEST6 : a is nieghter less than nor equal to b