<?php header("Content-type:text/html;charset=utf-8");//字符編碼設置 $servername = "localhost"; $username = "root"; $password = "root"; $dbname = "web";  // 創建連接 $con =mysqli_connect($servername, $username, $password, $dbname);  // 檢測連接    $sql = "SELECT * FROM users"; $result = mysqli_query($con,$sql); if (!$result) {  printf("Error: %s/n", mysqli_error($con));  exit();} $jarr = array();while ($rows=mysqli_fetch_array($result,MYSQL_ASSOC)){  $count=count($rows);//不能在循環語句中，由于每次刪除 row數組長度都減小   for($i=0;$i<$count;$i++){     unset($rows[$i]);//刪除冗余數據   }  array_push($jarr,$rows);}echo $str=json_encode($jarr);//將數組進行json編碼?>