直接上实例代码
<?php header("Content-type:text/html;charset=utf-8");//字符编码设置 $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "tjks"; // 创建连接 $con =mysfQPEJqli_connect($servername, $username, $password, $dbname); // 检测连接 $sql = "SELECT * FROM brands"; $result = mysqli_query($con,$sql); if (!$result) { printf("Error: %sn", mysqli_error($con)); exit();}$jarr = array();while ($rows=mysqli_fetch_array($result,MYSQL_ASSOC)){ $count=count($rows);//不能在循环语句中，由于每次删除 row数组长度都减小 for($i=0;$i<$count;$i++){ unset($rows[$i]);//删除冗余数据 } array_push($jarr,$rows);}print_r($jarr);//查看数组echo "<br/>"; echo '<hr>';echo '编码后的json字符串：';echo $str=json_encode($jarr);//将数组进行json编码echo '<br>';$arr=json_decode($str);//再进行json解码echo '解码后的数组：';print_r($arr);//打印解码后的数组，数据存储在对象数组中mysqli_close($con);?>输出内容如下：
Array ( [id] => 1 [name] => GNC ) Array ( [id] => 2 [name] => TCBJ ) Array ( [id] => 3 [name] => TJKS )
Unicode编码后的json数据: [{"id":"1","name":"GNC"},{"id":"2","name":"TCBJ"},{"id":"3","name":"TJKS"}]
可以看到，直接进行json_encode();编码，是将三个数组分别转为了json格式，而且两端会出现中括号！！还有另外一种写法
<?php header("Content-type:text/html;charset=utf-8");//字符编码设置 $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "tjks"; // 创建连接 $con =mysqli_connect($servername, $username, $password, $dbname); // 检测连接 $sql = "SELECT * FROM brands"; $result = mysqli_query($con,$sql); if (!$result) { printf("Error: %sn", mysqli_error($con)); exit();}$jarr = array();while ($rows=mysqli_fetch_array($result,MYSQL_ASSOC)){ $count=count($rows);//不能在循环语句中，由于每次删除 row数组长度都减小 for($i=0;$i<$count;$i++){ unset($rows[$i]);//删除冗余数据 } array_push($jarr,$rows);}print_r($jarr);//查看数组echo "<br/>";echo '<hr>';$jobj=new stdclass();//实例化stdclass，这是php内置的空类，可以用来传递数据，由于json_encode后的数据是以对象数组的形式存放的，//所以我们生成的时候也要把数据存储在对象中foreach($jarr as $key=>$value){$jobj->$key=$value;}echo '传递属性后的对象：';print_r($jobj);//打印传递属性后的对象echo '<br>';echo '编码后的jwww.easck.comson字符串：'.json_encode($jobj).'<br>';//打印编码后的json字符串mysqli_close($con);?>输出内容如下：
Array ( [0] => Array ( [id] => 1 [name] => GNC ) [1] => Array ( [id] => 2 [name] => TCBJ ) [2] => Array ( [id] => 3 [name] => TJKS ) )
传递属性后的对象：stdClass Object ( [0] => Array ( [id] => 1 [name] => GNC ) [1] => Array ( [id] => 2 [name] => TCBJ ) [2] => Array ( [id] => 3 [name] => TJKS ) )
编码后的json字符串：{"0":{"id":"1","name":"GNC"},"1":{"id":"2","name":"TCBJ"},"2":{"id":"3","name":"TJKS"}}
这样一来，中括号没有了，数组也成为了有序的数组！
总结
