Php 致命错误：无法重新声明已尝试的类类名错误require_once（）
我来自Java编程，我试图将我的知识应用于PHP中的OOP风格编程 所以，我尝试创建一个连接到数据库的实用程序类，就像我在Java中通常做的那样，在Java中我创建一个静态方法来获得数据库连接 然而，花了几个小时后，我仍然无法修复错误 DBHelper.phpPhp 致命错误：无法重新声明已尝试的类类名错误require_once（）,php,mysqli,pdo,Php,Mysqli,Pdo,我来自Java编程，我试图将我的知识应用于PHP中的OOP风格编程 所以，我尝试创建一个连接到数据库的实用程序类，就像我在Java中通常做的那样，在Java中我创建一个静态方法来获得数据库连接 然而，花了几个小时后，我仍然无法修复错误 DBHelper.php <?php class DBHelper { protected $db_name = 'myDb'; protected $db_user = 'root'; protected $db_pass = '
<?php
class DBHelper
{
protected $db_name = 'myDb';
protected $db_user = 'root';
protected $db_pass = '';
protected $db_host = 'localhost';
public function obtainConnection()
{
$mysqli_instance = new mysqli($this->db_host, $this->db_user, $this->db_pass, $this->db_name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
return $mysqli_instance;
}
}
?>
<?php
if (isset($_POST['submit'])) {
include "/DBUtility/DBHelper.php";
$username = $_POST['username']; //s means string
$password = $_POST['password']; // s means string
echo "<br/> Username value: " . $username;
echo "<br />Password value: " . $password;
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
//PREPARE THE PreparedStatment or Stored Procedure
$dbHelper = new DBHelper();
$connection = $dbHelper->obtainConnection();
$preparedStatement = $connection->prepare('CALL getUserRoleByLogin(?, ?)'); //getUserRoleByLogin() is the name of stored proc in mysql db
$preparedStatement->bind_param('ss', $username, $password); //assign arguments to ? ?
$preparedStatement->execute();//execute the stored procedure. This will return a result
$userRole = $preparedStatement->store_result();
$countOfRows = $preparedStatement->num_rows;
?>
# You can create a series of defines including the database
define('DB_HOST','localhost');
define('DB_NAME','dbname');
define('DB_USER','root');
define('DB_PASS','dbpassword');
# To maximize compatibility it's helpful to define fwd/back slash
define('DS',DIRECTORY_SEPARATOR);
# It is helpful to create path defines for easy file inclusion
define('ROOT_DIR',__DIR__);
define('CLASSES',ROOT_DIR.DS.'classes');
# Start session
session_start();
<?php
namespace DBUtility;
class DBHelper
{
protected $query;
private static $con;
public function connection()
{
# This will send back the connection without making a new one
if(self::$con instanceof \PDO)
return self::$con;
# I like to catch any pdo exceptions on connection, just incase.
try {
# Assign the connection
self::$con = new \PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USER,DB_PASS);
}
catch(\PDOException $e) {
# Here you can just die with a more user-friendly error.
# It would be helpful to save the actual error to a log file
$msg = $e->getMessage();
# I would put your log outside the root or in a protected folder
$txt = realpath(ROOT_DIR.DS.'..').DS.'errors'.DS.'sql.txt';
# Make a directory if none set
if(!is_dir(pathinfo($txt,PATHINFO_DIRNAME))) {
# Make the directory
if(mkdir(pathinfo($txt,PATHINFO_DIRNAME),0744,true)) {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
}
else {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
die("Site is under maintenance.");
}
}
# It would be helpful to create a query that will bind and not bind
public function query($sql,$bind = false)
{
if(is_array($bind)) {
foreach($bind as $key => $value) {
$sKey = ":{$key}";
$bindArr[$sKey] = $value;
}
$this->query = $this->connection()->prepare($sql);
$this->query->execute($bindArr);
}
else {
# The second "query" on this is the method from PDO, not the
# "query" method from this class
$this->query = $this->connection()->query($sql);
}
return $this;
}
public function getResults()
{
if(empty($this->query))
return false;
while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) {
$row[] = $result;
}
return (isset($row))? $row : false;
}
}
# If your page ends with a php tag, you should just remove it. It will
# protect against empty spaces that may cause "header already sent" errors
class Helper
{
public static function autoload($function)
{
if(function_exists($function))
return;
$path = ROOT_DIR.DS.'functions'.DS.$function.'.php';
if(is_file($path))
include_once($path);
}
}
function getUserRole($username,$password,\DBUtility\DBHelper $DBHelper)
{
return $DBHelper->query('CALL getUserRoleByLogin(:0, :1)',array($username,$password))->getResults();
}
# Include the config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
if (isset($_POST['submit'])) {
# No need for this line ->> include "/DBUtility/DBHelper.php";
# Use trim to remove empty spaces on the left and right
$username = trim($_POST['username']);
$password = trim($_POST['password']);
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
# User our function autoloader to include this function
Helper::autoload('getUserRole');
# Use the function and inject the DB class
$userRoles = getUserRole($username,$password,new \DBUtility\DBHelper());
$count = count($userRoles);
echo "Count: {$count}";
echo '<pre>';
print_r($userRoles);
echo '</pre>';
}
致命错误：无法重新声明类CLASSNAMErequire_once（“DBHelper.php”）include（“DBHelper.php”）
但仍然无法摆脱错误
我尝试将obtainConnection（）
设置为静态，并通过DBHelper:：obtainConnection（）调用它但是没有运气。相同的错误消息
我在打开类DBHelper的大括号时出错
{
我希望你能帮我做这件事
谢谢。在PHP中执行OOP时，应注意以下几点：
1） 我可能会重新考虑不直接将db凭据烘焙到类中，如果您想实现一个UI控制机制，那么通过UI修改它们会变得更困难/更麻烦。相反，尝试创建一个或可能是一个json
pref文件，或是一个动态创建的php
文件，其中包含一个数组，等等诸如此类。我将做一个定义，因为它最容易演示：
/config.php
<?php
class DBHelper
{
protected $db_name = 'myDb';
protected $db_user = 'root';
protected $db_pass = '';
protected $db_host = 'localhost';
public function obtainConnection()
{
$mysqli_instance = new mysqli($this->db_host, $this->db_user, $this->db_pass, $this->db_name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
return $mysqli_instance;
}
}
?>
<?php
if (isset($_POST['submit'])) {
include "/DBUtility/DBHelper.php";
$username = $_POST['username']; //s means string
$password = $_POST['password']; // s means string
echo "<br/> Username value: " . $username;
echo "<br />Password value: " . $password;
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
//PREPARE THE PreparedStatment or Stored Procedure
$dbHelper = new DBHelper();
$connection = $dbHelper->obtainConnection();
$preparedStatement = $connection->prepare('CALL getUserRoleByLogin(?, ?)'); //getUserRoleByLogin() is the name of stored proc in mysql db
$preparedStatement->bind_param('ss', $username, $password); //assign arguments to ? ?
$preparedStatement->execute();//execute the stored procedure. This will return a result
$userRole = $preparedStatement->store_result();
$countOfRows = $preparedStatement->num_rows;
?>
# You can create a series of defines including the database
define('DB_HOST','localhost');
define('DB_NAME','dbname');
define('DB_USER','root');
define('DB_PASS','dbpassword');
# To maximize compatibility it's helpful to define fwd/back slash
define('DS',DIRECTORY_SEPARATOR);
# It is helpful to create path defines for easy file inclusion
define('ROOT_DIR',__DIR__);
define('CLASSES',ROOT_DIR.DS.'classes');
# Start session
session_start();
<?php
namespace DBUtility;
class DBHelper
{
protected $query;
private static $con;
public function connection()
{
# This will send back the connection without making a new one
if(self::$con instanceof \PDO)
return self::$con;
# I like to catch any pdo exceptions on connection, just incase.
try {
# Assign the connection
self::$con = new \PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USER,DB_PASS);
}
catch(\PDOException $e) {
# Here you can just die with a more user-friendly error.
# It would be helpful to save the actual error to a log file
$msg = $e->getMessage();
# I would put your log outside the root or in a protected folder
$txt = realpath(ROOT_DIR.DS.'..').DS.'errors'.DS.'sql.txt';
# Make a directory if none set
if(!is_dir(pathinfo($txt,PATHINFO_DIRNAME))) {
# Make the directory
if(mkdir(pathinfo($txt,PATHINFO_DIRNAME),0744,true)) {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
}
else {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
die("Site is under maintenance.");
}
}
# It would be helpful to create a query that will bind and not bind
public function query($sql,$bind = false)
{
if(is_array($bind)) {
foreach($bind as $key => $value) {
$sKey = ":{$key}";
$bindArr[$sKey] = $value;
}
$this->query = $this->connection()->prepare($sql);
$this->query->execute($bindArr);
}
else {
# The second "query" on this is the method from PDO, not the
# "query" method from this class
$this->query = $this->connection()->query($sql);
}
return $this;
}
public function getResults()
{
if(empty($this->query))
return false;
while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) {
$row[] = $result;
}
return (isset($row))? $row : false;
}
}
# If your page ends with a php tag, you should just remove it. It will
# protect against empty spaces that may cause "header already sent" errors
class Helper
{
public static function autoload($function)
{
if(function_exists($function))
return;
$path = ROOT_DIR.DS.'functions'.DS.$function.'.php';
if(is_file($path))
include_once($path);
}
}
function getUserRole($username,$password,\DBUtility\DBHelper $DBHelper)
{
return $DBHelper->query('CALL getUserRoleByLogin(:0, :1)',array($username,$password))->getResults();
}
# Include the config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
if (isset($_POST['submit'])) {
# No need for this line ->> include "/DBUtility/DBHelper.php";
# Use trim to remove empty spaces on the left and right
$username = trim($_POST['username']);
$password = trim($_POST['password']);
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
# User our function autoloader to include this function
Helper::autoload('getUserRole');
# Use the function and inject the DB class
$userRoles = getUserRole($username,$password,new \DBUtility\DBHelper());
$count = count($userRoles);
echo "Count: {$count}";
echo '<pre>';
print_r($userRoles);
echo '</pre>';
}
2） 在config.php
文件中创建一个类，这样您就不必在页面中手动包含/要求类。它将自动包含它们：
spl_autoload_register(function($class) {
if(class_exists($class))
return;
# This will turn a namespace/class into a path so should turn:
# $db = new \DBUtility\DBHelper();
# into:
# /var/www/domain/httpdocs/classes/DBUtility/DBHelper.php
$path = str_replace(DS.DS,DS,CLASSES.DS.str_replace('\\',DS,$class).'.php');
# If the class file is located in the class folder, it will include it
if(is_file($path))
include_once($path);
});
3） 我将创建一个静态连接，这样您就不会每次都创建一个新连接（我也将使用）：
/classes/DBUtility/DBHelper.php
<?php
class DBHelper
{
protected $db_name = 'myDb';
protected $db_user = 'root';
protected $db_pass = '';
protected $db_host = 'localhost';
public function obtainConnection()
{
$mysqli_instance = new mysqli($this->db_host, $this->db_user, $this->db_pass, $this->db_name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
return $mysqli_instance;
}
}
?>
<?php
if (isset($_POST['submit'])) {
include "/DBUtility/DBHelper.php";
$username = $_POST['username']; //s means string
$password = $_POST['password']; // s means string
echo "<br/> Username value: " . $username;
echo "<br />Password value: " . $password;
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
//PREPARE THE PreparedStatment or Stored Procedure
$dbHelper = new DBHelper();
$connection = $dbHelper->obtainConnection();
$preparedStatement = $connection->prepare('CALL getUserRoleByLogin(?, ?)'); //getUserRoleByLogin() is the name of stored proc in mysql db
$preparedStatement->bind_param('ss', $username, $password); //assign arguments to ? ?
$preparedStatement->execute();//execute the stored procedure. This will return a result
$userRole = $preparedStatement->store_result();
$countOfRows = $preparedStatement->num_rows;
?>
# You can create a series of defines including the database
define('DB_HOST','localhost');
define('DB_NAME','dbname');
define('DB_USER','root');
define('DB_PASS','dbpassword');
# To maximize compatibility it's helpful to define fwd/back slash
define('DS',DIRECTORY_SEPARATOR);
# It is helpful to create path defines for easy file inclusion
define('ROOT_DIR',__DIR__);
define('CLASSES',ROOT_DIR.DS.'classes');
# Start session
session_start();
<?php
namespace DBUtility;
class DBHelper
{
protected $query;
private static $con;
public function connection()
{
# This will send back the connection without making a new one
if(self::$con instanceof \PDO)
return self::$con;
# I like to catch any pdo exceptions on connection, just incase.
try {
# Assign the connection
self::$con = new \PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USER,DB_PASS);
}
catch(\PDOException $e) {
# Here you can just die with a more user-friendly error.
# It would be helpful to save the actual error to a log file
$msg = $e->getMessage();
# I would put your log outside the root or in a protected folder
$txt = realpath(ROOT_DIR.DS.'..').DS.'errors'.DS.'sql.txt';
# Make a directory if none set
if(!is_dir(pathinfo($txt,PATHINFO_DIRNAME))) {
# Make the directory
if(mkdir(pathinfo($txt,PATHINFO_DIRNAME),0744,true)) {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
}
else {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
die("Site is under maintenance.");
}
}
# It would be helpful to create a query that will bind and not bind
public function query($sql,$bind = false)
{
if(is_array($bind)) {
foreach($bind as $key => $value) {
$sKey = ":{$key}";
$bindArr[$sKey] = $value;
}
$this->query = $this->connection()->prepare($sql);
$this->query->execute($bindArr);
}
else {
# The second "query" on this is the method from PDO, not the
# "query" method from this class
$this->query = $this->connection()->query($sql);
}
return $this;
}
public function getResults()
{
if(empty($this->query))
return false;
while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) {
$row[] = $result;
}
return (isset($row))? $row : false;
}
}
# If your page ends with a php tag, you should just remove it. It will
# protect against empty spaces that may cause "header already sent" errors
class Helper
{
public static function autoload($function)
{
if(function_exists($function))
return;
$path = ROOT_DIR.DS.'functions'.DS.$function.'.php';
if(is_file($path))
include_once($path);
}
}
function getUserRole($username,$password,\DBUtility\DBHelper $DBHelper)
{
return $DBHelper->query('CALL getUserRoleByLogin(:0, :1)',array($username,$password))->getResults();
}
# Include the config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
if (isset($_POST['submit'])) {
# No need for this line ->> include "/DBUtility/DBHelper.php";
# Use trim to remove empty spaces on the left and right
$username = trim($_POST['username']);
$password = trim($_POST['password']);
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
# User our function autoloader to include this function
Helper::autoload('getUserRole');
# Use the function and inject the DB class
$userRoles = getUserRole($username,$password,new \DBUtility\DBHelper());
$count = count($userRoles);
echo "Count: {$count}";
echo '<pre>';
print_r($userRoles);
echo '</pre>';
}
4） 创建有用的/可重用的函数或类/方法
/functions/getUserRole.php
<?php
class DBHelper
{
protected $db_name = 'myDb';
protected $db_user = 'root';
protected $db_pass = '';
protected $db_host = 'localhost';
public function obtainConnection()
{
$mysqli_instance = new mysqli($this->db_host, $this->db_user, $this->db_pass, $this->db_name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
return $mysqli_instance;
}
}
?>
<?php
if (isset($_POST['submit'])) {
include "/DBUtility/DBHelper.php";
$username = $_POST['username']; //s means string
$password = $_POST['password']; // s means string
echo "<br/> Username value: " . $username;
echo "<br />Password value: " . $password;
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
//PREPARE THE PreparedStatment or Stored Procedure
$dbHelper = new DBHelper();
$connection = $dbHelper->obtainConnection();
$preparedStatement = $connection->prepare('CALL getUserRoleByLogin(?, ?)'); //getUserRoleByLogin() is the name of stored proc in mysql db
$preparedStatement->bind_param('ss', $username, $password); //assign arguments to ? ?
$preparedStatement->execute();//execute the stored procedure. This will return a result
$userRole = $preparedStatement->store_result();
$countOfRows = $preparedStatement->num_rows;
?>
# You can create a series of defines including the database
define('DB_HOST','localhost');
define('DB_NAME','dbname');
define('DB_USER','root');
define('DB_PASS','dbpassword');
# To maximize compatibility it's helpful to define fwd/back slash
define('DS',DIRECTORY_SEPARATOR);
# It is helpful to create path defines for easy file inclusion
define('ROOT_DIR',__DIR__);
define('CLASSES',ROOT_DIR.DS.'classes');
# Start session
session_start();
<?php
namespace DBUtility;
class DBHelper
{
protected $query;
private static $con;
public function connection()
{
# This will send back the connection without making a new one
if(self::$con instanceof \PDO)
return self::$con;
# I like to catch any pdo exceptions on connection, just incase.
try {
# Assign the connection
self::$con = new \PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USER,DB_PASS);
}
catch(\PDOException $e) {
# Here you can just die with a more user-friendly error.
# It would be helpful to save the actual error to a log file
$msg = $e->getMessage();
# I would put your log outside the root or in a protected folder
$txt = realpath(ROOT_DIR.DS.'..').DS.'errors'.DS.'sql.txt';
# Make a directory if none set
if(!is_dir(pathinfo($txt,PATHINFO_DIRNAME))) {
# Make the directory
if(mkdir(pathinfo($txt,PATHINFO_DIRNAME),0744,true)) {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
}
else {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
die("Site is under maintenance.");
}
}
# It would be helpful to create a query that will bind and not bind
public function query($sql,$bind = false)
{
if(is_array($bind)) {
foreach($bind as $key => $value) {
$sKey = ":{$key}";
$bindArr[$sKey] = $value;
}
$this->query = $this->connection()->prepare($sql);
$this->query->execute($bindArr);
}
else {
# The second "query" on this is the method from PDO, not the
# "query" method from this class
$this->query = $this->connection()->query($sql);
}
return $this;
}
public function getResults()
{
if(empty($this->query))
return false;
while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) {
$row[] = $result;
}
return (isset($row))? $row : false;
}
}
# If your page ends with a php tag, you should just remove it. It will
# protect against empty spaces that may cause "header already sent" errors
class Helper
{
public static function autoload($function)
{
if(function_exists($function))
return;
$path = ROOT_DIR.DS.'functions'.DS.$function.'.php';
if(is_file($path))
include_once($path);
}
}
function getUserRole($username,$password,\DBUtility\DBHelper $DBHelper)
{
return $DBHelper->query('CALL getUserRoleByLogin(:0, :1)',array($username,$password))->getResults();
}
# Include the config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
if (isset($_POST['submit'])) {
# No need for this line ->> include "/DBUtility/DBHelper.php";
# Use trim to remove empty spaces on the left and right
$username = trim($_POST['username']);
$password = trim($_POST['password']);
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
# User our function autoloader to include this function
Helper::autoload('getUserRole');
# Use the function and inject the DB class
$userRoles = getUserRole($username,$password,new \DBUtility\DBHelper());
$count = count($userRoles);
echo "Count: {$count}";
echo '<pre>';
print_r($userRoles);
echo '</pre>';
}
/index.php
<?php
class DBHelper
{
protected $db_name = 'myDb';
protected $db_user = 'root';
protected $db_pass = '';
protected $db_host = 'localhost';
public function obtainConnection()
{
$mysqli_instance = new mysqli($this->db_host, $this->db_user, $this->db_pass, $this->db_name);
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
return $mysqli_instance;
}
}
?>
<?php
if (isset($_POST['submit'])) {
include "/DBUtility/DBHelper.php";
$username = $_POST['username']; //s means string
$password = $_POST['password']; // s means string
echo "<br/> Username value: " . $username;
echo "<br />Password value: " . $password;
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
//PREPARE THE PreparedStatment or Stored Procedure
$dbHelper = new DBHelper();
$connection = $dbHelper->obtainConnection();
$preparedStatement = $connection->prepare('CALL getUserRoleByLogin(?, ?)'); //getUserRoleByLogin() is the name of stored proc in mysql db
$preparedStatement->bind_param('ss', $username, $password); //assign arguments to ? ?
$preparedStatement->execute();//execute the stored procedure. This will return a result
$userRole = $preparedStatement->store_result();
$countOfRows = $preparedStatement->num_rows;
?>
# You can create a series of defines including the database
define('DB_HOST','localhost');
define('DB_NAME','dbname');
define('DB_USER','root');
define('DB_PASS','dbpassword');
# To maximize compatibility it's helpful to define fwd/back slash
define('DS',DIRECTORY_SEPARATOR);
# It is helpful to create path defines for easy file inclusion
define('ROOT_DIR',__DIR__);
define('CLASSES',ROOT_DIR.DS.'classes');
# Start session
session_start();
<?php
namespace DBUtility;
class DBHelper
{
protected $query;
private static $con;
public function connection()
{
# This will send back the connection without making a new one
if(self::$con instanceof \PDO)
return self::$con;
# I like to catch any pdo exceptions on connection, just incase.
try {
# Assign the connection
self::$con = new \PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME,DB_USER,DB_PASS);
}
catch(\PDOException $e) {
# Here you can just die with a more user-friendly error.
# It would be helpful to save the actual error to a log file
$msg = $e->getMessage();
# I would put your log outside the root or in a protected folder
$txt = realpath(ROOT_DIR.DS.'..').DS.'errors'.DS.'sql.txt';
# Make a directory if none set
if(!is_dir(pathinfo($txt,PATHINFO_DIRNAME))) {
# Make the directory
if(mkdir(pathinfo($txt,PATHINFO_DIRNAME),0744,true)) {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
}
else {
# Save to log file
file_put_contents($txt,$msg.PHP_EOL);
}
die("Site is under maintenance.");
}
}
# It would be helpful to create a query that will bind and not bind
public function query($sql,$bind = false)
{
if(is_array($bind)) {
foreach($bind as $key => $value) {
$sKey = ":{$key}";
$bindArr[$sKey] = $value;
}
$this->query = $this->connection()->prepare($sql);
$this->query->execute($bindArr);
}
else {
# The second "query" on this is the method from PDO, not the
# "query" method from this class
$this->query = $this->connection()->query($sql);
}
return $this;
}
public function getResults()
{
if(empty($this->query))
return false;
while($result = $this->query->fetch(\PDO::FETCH_ASSOC)) {
$row[] = $result;
}
return (isset($row))? $row : false;
}
}
# If your page ends with a php tag, you should just remove it. It will
# protect against empty spaces that may cause "header already sent" errors
class Helper
{
public static function autoload($function)
{
if(function_exists($function))
return;
$path = ROOT_DIR.DS.'functions'.DS.$function.'.php';
if(is_file($path))
include_once($path);
}
}
function getUserRole($username,$password,\DBUtility\DBHelper $DBHelper)
{
return $DBHelper->query('CALL getUserRoleByLogin(:0, :1)',array($username,$password))->getResults();
}
# Include the config file
require_once(__DIR__.DIRECTORY_SEPARATOR.'config.php');
if (isset($_POST['submit'])) {
# No need for this line ->> include "/DBUtility/DBHelper.php";
# Use trim to remove empty spaces on the left and right
$username = trim($_POST['username']);
$password = trim($_POST['password']);
}
if (empty($username) || empty($password) ) {
echo "Fill out the fields!";
} else {
# User our function autoloader to include this function
Helper::autoload('getUserRole');
# Use the function and inject the DB class
$userRoles = getUserRole($username,$password,new \DBUtility\DBHelper());
$count = count($userRoles);
echo "Count: {$count}";
echo '<pre>';
print_r($userRoles);
echo '</pre>';
}
#包括配置文件
需要一次（uuu DIR_uu.DIRECTORY_useparator.config.php'）；
如果（isset（$_POST['submit']））{
#不需要这行->>包括“/DBUtility/DBHelper.php”；
#使用“修剪”删除左右两侧的空白
$username=trim（$_POST['username']）；
$password=trim（$_POST['password']）；
}
if（空（$username）| |空（$password））{
echo“填写字段！”；
}否则{
#使用我们的函数autoloader包含此函数
Helper:：autoload（'getUserRole'）；
#使用函数并注入DB类
$userRoles=getUserRole（$username，$password，new\DBUtility\DBHelper（））；
$count=count（$userRoles）；
echo“Count:{$Count}”；
回声'；
打印（用户角色）；
回声'；
}
好吧，你做require\u once
或include\u once
是对的。它说你不能重新声明“DBHelper”吗或者类名是什么？@Rasclatt首先，谢谢。是的，我收到错误致命错误：无法重新声明类DbHelper其他原因可能是1）您使用的名称与已在其他地方创建的类相同（可能是由其他人创建的），在这种情况下，您应该使用名称空间2）也许您复制了此文件以便重命名和扩展它，但忘记了更改重复文件上的类名。此外，如果您只是在使用PHP new，我建议使用PDO
而不是mysqli_uu
，尽管这是个人偏好，但我认为您会发现它更简单绑定值，一般来说更简单。您可以将数组直接放入execute（）
中，如$preparedStatement->execute（数组（“：0”=>$username，：1”=>$password））
我发现PDO更容易自动化和使用，但正如我所说，这是个人的偏好。感谢所有的提示。所有这些都将在未来有用，因为我将继续学习PHP中的OOP编程方式。你实际上是对的，我必须使用名称空间和require_一起修复错误。我将研究示例y你已经给出了。大多数OOP模式和风格与我在Java中的做法相似。我只需要学习一些关键字和命令。再次感谢。我的问题通过使用名称空间得到了解决。希望其中一些内容有帮助，我添加了一些额外的内容，我注意到我没有很好地解决一些问题，或者在某些情况下根本没有解决干杯