【发布时间】：2018-08-08 17:40:50
【问题描述】：
我有一个脚本可以连接到我在 MYSQL 中的数据库，并且我使用 PDO 进行连接。因此，当我使用 session_start 时，它会不断重新加载我的页面，但是当评论它//session_start(); 时，它可以完美运行。我做错了什么？
代码
<?php
ob_start();
//session_start();
//$_SESSION['already_submitted'] = false;
$timezone = date_default_timezone_set("Europe/London");
$DB_host = "localhost";
$DB_user = "root";
$DB_pass = "";
$DB_name = "db_name";
// Set the credentials for the database and make a new PDO connection,
// if the connection fails display the error.
try
{
$DB_con = new PDO("mysql:host={$DB_host};dbname={$DB_name}",$DB_user,$DB_pass);
$DB_con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
echo $e->getMessage();
}
include_once 'class.crud.php';
$crud = new crud($DB_con);
?>
class.crud.php（只是一个帮助我更快速地使用 crud 的类文件）
<?php
class crud
{
private $db;
public function __construct($DB_con)
{
$this->db = $DB_con;
}
public function getID($id, $mod_name)
{
$stmt = $this->db->prepare("SELECT * FROM $mod_name WHERE id=:id");
$stmt->execute(array(":id" => $id));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
return $row;
}
public function getPassword($contrasena)
{
$stmt = $this->db->prepare("SELECT * FROM users WHERE username=:username");
$stmt->execute(array(":username" => "Fred"));
$row = $stmt->fetch(PDO::FETCH_ASSOC);
if (!password_verify($contrasena, $row['password'])) {
?>
<div class="uk-alert uk-alert-danger" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Error!</strong> Contraseña.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
} else {
// Success!
return $row;
}
}
//combobox
public function select($column, $mod_name)
{
$stmt = $this->db->prepare("SELECT $column FROM $mod_name ORDER BY id");
$stmt->execute();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo '<option value="' . ucwords(strtolower($row['firstname'])) . ' ' . ucwords(strtolower($row['lastname'])) . '">' . ucwords(strtolower($row['firstname'])) . ' ' . ucwords(strtolower($row['lastname'])) . '</option>';
}
}
public function insert($table, $data)
{
ksort($data);
$fieldNames = implode('`,`', array_keys($data));
$fieldValues = ':' . implode(', :', array_keys($data));
$stmt = $this->db->prepare("INSERT INTO $table (`$fieldNames`) VALUES ($fieldValues)");
foreach ($data as $key => $value) {
$stmt->bindValue(":$key", $value);
}
if (!$stmt->execute()) {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Error!</strong> Registro no agregado,
<?php $this->handleError();
echo $stmt->errorInfo();
?>.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
} else {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Exito!</strong> Registro agregado.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
}
}
public function update($table, $data, $where)
{
$table;
ksort($data);
$fieldDetails = null;
foreach ($data as $key => $value) {
$fieldDetails .= "`$key`=:$key,";
}
$fieldDetails = rtrim($fieldDetails, ',');
$stmt = $this->db->prepare("UPDATE $table SET $fieldDetails WHERE $where");
foreach ($data as $key => $value) {
$stmt->bindValue(":$key", $value);
}
if (!$stmt->execute()) {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Error!</strong> Registro no actualizado,
<?php $this->handleError();
echo $stmt->errorInfo();
?>.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
} else {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Exito!</strong> Registro actualizado.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
}
}
public function delete($table, $data, $where, $limit = 1)
{
$stmt = $this->db->prepare("DELETE FROM $table WHERE $where LIMIT $limit");
foreach ($data as $key => $value) {
$stmt->bindValue(":$key", $value);
}
if (!$stmt->execute()) {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Error!</strong> Registro no elminado,
<?php $this->handleError();
echo $stmt->errorInfo();
?>.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
} else {
?>
<div class="uk-alert uk-alert-success" data-uk-alert>
<a href="#" id="hide-alert" class="uk-alert-close uk-close"></a>
<strong>Exito!</strong> Registro eliminado.
</div>
<script>
function show_alert() {
$("#hide-alert").click();
}
window.setTimeout(function () {
show_alert();
}, 5000);
</script>
<?php
return true;
}
}
/* error check */
private function handleError()
{
if ($this->errorCode() != '00000') {
if ($this->_errorLog == true)
//Log::write($this->_errorLog, "Error: " . implode(',', $this->errorInfo()));
{
echo json_encode($this->errorInfo());
}
throw new Exception("Error: " . implode(',', $this->errorInfo()));
}
}
/* count rows*/
public function rowsCount($table)
{
$stmt = $this->prepare("SELECT * FROM " . $table);
$stmt->execute();
return $stmt->rowCount();
}
}
【问题讨论】：
-
能不能把class.crud.php的代码也显示一下
-
是的，当然，我会编辑我的问题。
-
也许尝试检查会话是否已在页面加载时启动，如果不是，则加载它？ stackoverflow.com/a/18542272/5827005 - 也许会有所帮助。如果您使用的是 PHP 框架，则不需要在每个页面上打开会话，而是在单个全局文件中。
-
谢谢，但它是一个单页 index.php，我在其中包含了我的连接文件“config.php”，所以我很确定在加载索引页之前它没有启动。但无论如何我尝试了你的解决方案并不起作用。