• PHP 视频教程

PHP - 比较运算符示例

尝试以下示例来了解所有比较运算符。将以下 PHP 程序复制并粘贴到 test.php 文件中，并将其保存在 PHP 服务器的文档根目录中，然后使用任何浏览器浏览它。

现场演示 
<html>
   
   <head>
      <title>Comparison Operators</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 greater than or equal to b<br/>";
         }else {
            echo "TEST5 : a is neither 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 neither 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 greater than or equal to b
TEST6 : a is neither less than nor equal to b
php_operator_types.htm