嗨,我是 PHP 新手,我正在尝试从 MySQL 表中获取 JSON 数组形式的数据。我确实从 PHP 文件中获取了 JSON 数组,但第一个索引上有一个空数组。
这是我在 MySQL 上创建的表结构:
CREATE TABLE IF NOT EXISTS `tbl_employee` (
`employee_id` int(4) NOT NULL AUTO_INCREMENT,
`employee_name` varchar(60) NOT NULL,
`designation` varchar(30) NOT NULL,
`hired_date` date NOT NULL,
`salary` int(10) NOT NULL,
PRIMARY KEY (`employee_id`),
);
INSERT INTO `tbl_employee` (`employee_id`, `employee_name`, `designation`, `hired_date`, `salary`) VALUES
(1, 'Steve', 'VP', '2013-08-01', 60000),
(2, 'Robert', 'Executive' '2014-10-09', 20000),
(3, 'Luci', 'Manager', '2013-08-20', 40000);
(4, 'Joe', 'Executive', '2013-06-01', 25000);
(5, 'Julia', 'Trainee', '2014-10-01', 10000);
这是我的 PHP 文件:
<?php
//open connection to mysql db
$dbhost = 'clvm.ddns.net:8026';
$dbuser = 'root';
$dbpass = '';
$dbname = 'ta_trial';
//$conn = mysql_connect($dbhost, $dbuser, $dbpass);
$connection = mysqli_connect($dbhost,$dbuser,$dbpass,$dbname) or die("Error " . mysqli_error($connection));
//fetch table rows from mysql db
$sql = "select * from tbl_employee";
$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));
//create an array
$emparray[] = array();
while($row =mysqli_fetch_assoc($result))
{
$emparray[] = $row;
}
echo json_encode($emparray);
?>
这就是我得到的:
[[],{"employee_id":"1","employee_name":"Steve","designation":"VP","hired_date":"2013-08-01","salary":"60000"},{"employee_id":"2","employee_name":"Robert","designation":"Executive","hired_date":"2014-10-29","salary":"20000"},{"employee_id":"3","employee_name":"Luci","designation":"Manager","hired_date":"2013-08-20","salary":"40000"},{"employee_id":"4","employee_name":"Joe","designation":"Executive","hired_date":"2013-06-01","salary":"25000"},{"employee_id":"5","employee_name":"Julia","designation":"Trainee","hired_date":"2014-10-01","salary":"10000"}]
我不明白为什么第一个索引上会有一个空数组?谁能指出错误或我在这里做错了什么?有没有更好的解决方案来做到这一点?谢谢您,任何帮助将不胜感激。
最佳答案
你错过了一些东西 $emparray[] = array();到 $emparray = array();
<?php
//open connection to mysql db
$dbhost = 'clvm.ddns.net:8026';
$dbuser = 'root';
$dbpass = '';
$dbname = 'ta_trial';
//$conn = mysql_connect($dbhost, $dbuser, $dbpass);
$connection = mysqli_connect($dbhost,$dbuser,$dbpass,$dbname) or die("Error " . mysqli_error($connection));
//fetch table rows from mysql db
$sql = "select * from tbl_employee";
$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));
//create an array
$emparray = array();
while($row =mysqli_fetch_assoc($result))
{
$emparray[] = $row;
}
echo json_encode($emparray);
?>
检查结果是否正常
关于PHP json_encode 在 MySQL 表的第一个索引上返回空数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30686092/