查询每个数据表 字段 字段类型  字段解释

查询不同数据表中的相同字段

<?php

    echo”hello world<br />”;
    echo’hello world<br />’;
    $my_variable =”hello world”;
    echo $my_variable;
    echo $my_variable .  “Again”;

?>
<?php

      echo “$my_variable Again.”;
      echo “{$my_variable} Again.”;
      echo ‘$my_variable Again.’    //$my_variable Again

?>

Varibles Name
1.Start with a $
2.followed by letter or underscore
3.No space
4.case-sensitive