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1. 首先进行设置，允许html内运行php代码：
2. 在头文件内插入php代码（运行界面后自动连接数据库）

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        检索成功
   ';                         $notebook=$_POST['check_notebook'];                         $a_notebook= mysqli_query($conn,"SELECT bookName,id FROM notebook WHERE bookName LIKE '%$notebook%' AND isDelete=0 AND userid='$userid'");                          while($b_notebook = mysqli_fetch_array($a_notebook)){                             $notebooklook=$b_notebook['bookName'];                             $notebookid=$b_notebook['id'];                             $B="'$notebooklook'";                            echo ''.$notebooklook.'';                             $a_noteTitle= mysqli_query($conn,"SELECT noteTitle FROM note WHERE notebookID='$notebookid' AND isdelete=0");                            while($b_notebook = mysqli_fetch_array($a_noteTitle)){                                 $noteTitle=$b_notebook['noteTitle'];                                 $A="'$noteTitle'";                                    echo ''.$noteTitle.'';                             }                        }                     }                ?>

    

    

效果图