<?php//调用数据库的函数function connetionsql(){$conn=mysqli_connect("127.0.0.1",'root','','user');if (!$conn) {die("连接失败".mysqli_error());}mysqli_set_charset($conn,"utf8");$sql="select * from user1";$res=mysqli_query($conn,$sql);// mysqli_affected_rows()返回前一次 MySQL 操作所影响的记录行数。// $row=mysqli_affected_rows($conn);// mysqli_num_fields()    返回结果集中字段的数量。$col=mysqli_num_fields($res);echo "<table border='1'><tr>";// 取出字段名作为表名for ($i=0; $i <$col ; $i++) { // mysqli_fetch_field_direct()    从结果集中取得某个单一字段的 meta-data，并作为对象返回。$file_name=mysqli_fetch_field_direct($res,$i);// echo $file_name->name;echo "<th>$file_name->name</th>";}echo "</tr>";// mysqli_fetch_row()    从结果集中取得一行，并作为枚举数组返回。while ($row=mysqli_fetch_row($res)) {echo "<tr>";for ($i=0; $i <$col ; $i++) { echo "<td>$row[$i]</td>";}echo "</tr>";}echo "</table>";}connetionsql();
?>

<table border='1'><tr><th>id</th><th>name</th><th>password</th><th>email</th><th>age</th></tr><tr><td>4</td><td>huahua</td><td>e10adc3949ba59abbe56e057f20f883e</td><td>huahua@qq.com</td><td>16</td></tr><tr><td>32</td><td>haha</td><td>e10adc3949ba59abbe56e057f20f883e</td><td>test@qq.com</td><td>16</td></tr><tr><td>28</td><td>test</td><td>e10adc3949ba59abbe56e057f20f883e</td><td>test@qq.com</td><td>16</td></tr><tr><td>31</td><td>嘿嘿</td><td>e10adc3949ba59abbe56e057f20f883e</td><td>test@qq.com</td><td>16</td></tr>
</table>

        // mysqli_fetch_fields()    返回结果中代表字段的对象的数组。$field_info=mysqli_fetch_fields($res);var_dump($field_info);//返回的是一个二位数组，如下：// array(5) { // [0]=> object(stdClass)#3 (13) // { ["name"]=> string(2) "id" // ["orgname"]=> string(2) "id" // ["table"]=> string(5) "user1" // ["orgtable"]=> string(5) "user1" // ["def"]=> string(0) "" // ["db"]=> string(4) "user" // ["catalog"]=> string(3) "def" // ["max_length"]=> int(2) // ["length"]=> int(11) // ["charsetnr"]=> int(63) // ["flags"]=> int(49667) // ["type"]=> int(3) // ["decimals"]=> int(0) // } foreach ($field_info as $key =>$value) {// echo "<br/>".$val->name;echo "<br/>.-----";echo $key;echo "=========";echo $value->name;}

//数字为下标
.-----0=========id
.-----1=========name
.-----2=========password
.-----3=========email
.-----4=========age

        // mysqli_fetch_field() 函数从结果集中取得下一字段（列），并作为对象返回。while ($field_info=mysqli_fetch_field($res)) {echo "<br/>".$field_info->name;}

id
name
password
email
age