我创建的上载文件的类遇到问题。此类有一个父类，它是数据库访问层。上传看起来像这样：
<?php
class upload extends bao {
// general variables
private $basePath = '../../uploads/';
private $fullMaxWidth = 1000;
private $mediumMaxWidth = 500;
private $smallMaxWidth = 250;
private $errors = 0;
private $difference = 0;
private $debugging = false;
private $maxFileSize = 100000000;
// current file variables
private $currFileName = '';
private $currFileType = '';
private $currFileTmpName = '';
private $currFileError = 0;
private $currFileSize = 0;
private $currExt = '';
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
This will overwrite any default values with whats supplied
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
public function __construct( $params = null ) {
if($this -> debugging) {
echo '__construct method';
}
if( $params ) {
foreach( $params as $key => $val ) {
$this -> $key = $val;
}
}
$this -> initiate();
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Initiates the upload process
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
private function initiate() {
if( $this -> debugging ) {
echo 'initiate method';
}
for($i = 0; $i < count($_FILES['files']['name']); $i++) {
$fileCheck = $this -> checkFileSize( $_FILES['files']['size'][$i] );
if(!$fileCheck) {
$this -> errors++;
}
$this -> currFileType = $_FILES['files']['type'][$i];
$this -> currFileTmpName = $_FILES['files']['tmp_name'][$i];
$fileExtPath = pathinfo($_FILES['files']['name'][$i]);
$this -> currExt = strtolower($fileExtPath['extension']);
if($this -> errors < 1) {
$this -> switcher();
}
}
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Runs a check to see what the file size is
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
private function checkFileSize( $fileSize ) {
if($this -> debugging) {
echo 'checkFileSize method';
}
if($fileSize <= $this -> maxFileSize) {
return true;
} else {
return false;
}
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Determines which type of file it is
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
private function switcher() {
if($this -> debugging) {
echo 'switcher method';
}
if( $this -> currFileType == 'image/gif' || $this -> currFileType == 'image/png' || $this -> currFileType == 'image/jpeg') {
$this -> image();
} else {
$this -> other();
}
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Uploads all image files
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
private function image() {
if($this -> debugging) {
echo 'image method';
}
$rand = rand(1000, 10000);
$newFullName = time() .'-'. $_COOKIE['isLogged'] .'-'. $rand .'-full.'. $this -> currExt;
$newMediumName = time() .'-'. $_COOKIE['isLogged'] .'-'. $rand .'-medium.'. $this -> currExt;
$newSmallName = time() .'-'. $_COOKIE['isLogged'] .'-'. $rand .'-small.'. $this -> currExt;
$fullPath = $this -> basePath . $newFileName;
$info = getimagesize( $this -> currFileTmpName );
$fullWidth = $this -> getNewWidth( $this -> fullMaxWidth, $info[0] );
$mediumWidth = $this -> getNewWidth( $this -> mediumMaxWidth, $info[0] );
$smallWidth = $this -> getNewWidth( $this -> smallMaxWidth, $info[0] );
$fullDif = $this -> setDifference( $this -> fullMaxWidth, $info[0] );
$mediumDif = $this -> setDifference( $this -> mediumMaxWidth, $info[0] );
$smallDif = $this -> setDifference( $this -> smallMaxWidth, $info[0] );
$fullHeight = $this -> getNewHeight( $info[1], $fullDif );
$mediumHeight = $this -> getNewHeight( $info[1], $mediumDif );
$smallHeight = $this -> getNewHeight( $info[1], $smallDif );
// set debugging to try to output new image sizes
if( $this -> debugging ) {
echo $fullWidth .' - '. $fullHeight .'<br/>';
echo $mediumWidth .' - '. $mediumHeight .'<br/>';
echo $smallWidth .' - '. $smallHeight .'<br/>';
}
$smallImage = imagecreatetruecolor($smallWidth, $smallHeight);
$mediumImage = imagecreatetruecolor($mediumWidth, $mediumHeight);
$fullImage = imagecreatetruecolor($fullWidth, $fullHeight);
switch($info['mime']) {
case 'image/gif':
$smallImg = imagecreatefromgif( $this -> currFileTmpName );
$mediumImg = imagecreatefromgif( $this -> currFileTmpName );
$fullImg = imagecreatefromgif( $this -> currFileTmpName );
break;
case 'image/png':
$smallImg = imagecreatefrompng( $this -> currFileTmpName );
$mediumImg = imagecreatefrompng( $this -> currFileTmpName );
$fullImg = imagecreatefrompng( $this -> currFileTmpName );
break;
default:
$smallImg = imagecreatefromjpeg( $this -> currFileTmpName );
$mediumImg = imagecreatefromjpeg( $this -> currFileTmpName );
$fullImg = imagecreatefromjpeg( $this -> currFileTmpName );
break;
}
imagecopyresampled($smallImage, $smallImg, 0, 0, 0, 0, $smallWidth, $smallHeight, $info[0], $info[1] );
imagecopyresampled($mediumImage, $mediumImg, 0, 0, 0, 0, $mediumWidth, $mediumHeight, $info[0], $info[1] );
imagecopyresampled($fullImage, $fullImg, 0, 0, 0, 0, $fullWidth, $fullHeight, $info[0], $info[1] );
if($info['mime'] == 'image/gif') {
imagegif( $smallImage, $this -> basePath . $newSmallName );
imagegif( $mediumImage, $this -> basePath . $newMediumName );
imagegif( $fullImage, $this -> basePath . $newFullName );
} elseif($info['mime'] == 'image/png') {
imagepng( $smallImage, $this -> basePath . $newSmallName, 8);
imagepng( $mediumImage, $this -> basePath . $newMediumName, 8);
imagepng( $fullImage, $this -> basePath . $newFullName, 8);
} else {
imagejpeg( $smallImage, $this -> basePath . $newSmallName, 80);
imagejpeg( $mediumImage, $this -> basePath . $newMediumName, 80);
imagejpeg( $fullImage, $this -> basePath . $newFullName, 80);
}
// insert into database
$stringQuery = "INSERT INTO uploads (uid,smallFilename,mediumFilename,fullFilename,typeFile,status,createdOn,modifiedOn)VALUES(:uid, :smallFilename, :mediumFilename, :fullFilename, :typeFile, :status, :createdOn, :modifiedOn )";
$binding = array(":uid" => $_COOKIE['userId'], ":smallFilename" => $newSmallName, ":mediumFilename" => $newMediumName, ":fullFilename" => $newFullName, ":typeFile" => $this -> currExt, ":status" => "new", ":createdOn" => currentTime, ":modifiedOn" => currentTime );
$insertDB = parent::query( $stringQuery, $binding );
if( !$insertDB ) {
$this -> errors++;
}
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Uploads all files minus images
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
private function other() {
if($this -> debugging) {
echo 'other method';
}
$rand = rand(1000, 10000);
$newFullName = time() .'-'. $_COOKIE['isLogged'] .'-'. $rand .'.'. $this -> currExt;
$fullPath = $this -> basePath . $newFullName;
if(move_uploaded_file($this -> currFileTmpName, $fullPath)){
$stringQuery = "INSERT INTO uploads (uid,fullFilename,title,description,keywords,typeFile,uploadedType,uploadedId,status,createdOn,modifiedOn)VALUES(:uid,:fullFilename,:typeFile,:uploadedType,:uploadedId,:status,:createdOn,:modifiedOn)";
$binding = array( ":uid" => $_COOKIE['userId'], ":fullFilename" => $newFullName, ":typeFile" => $this -> currExt, ":uploadedType" => "", ":uploadedId" => "", ":status" => "new", ":createdOn" => currentTime, ":modifiedOn" => currentTime );
$insertDB = parent::query( $stringQuery, $binding );
if( !$insertDB ) {
$this -> errors++;
}
} else {
echo 'There was an error';
}
}
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Utility methods
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
// if image does not match size set the difference
private function setDifference( $fullwidth, $width ) {
if($this -> debugging) {
echo 'setDifference method';
}
return $fullwidth / $width;
}
// calculate the new width
private function getNewWidth( $fullwidth, $width ) {
if($this -> debugging) {
echo 'getNewWidth method';
}
$this -> difference = $fullwidth / $width;
return round($width * $this -> difference);
}
// calculate the new height
private function getNewHeight( $height, $diff ) {
if($this -> debugging) {
echo 'getNewHeight method';
}
$newHeight = round($height * $diff );
return $newHeight;
}
// creates new image for 3 sizes
private function createImageTrueFull( $width, $height ) {
if($this -> debugging) {
echo 'createImageTrueFull method';
}
return imagecreatetruecolor( $width, $height );
}
}
?>
基本数据库访问层如下所示：
<?php
class bao {
private $environments = array(
'development' => array(
),
'test' => array(
),
'review' => array(
),
'production' => array(
),
);
private $url = '',
$host = '',
$dbname = '',
$user = '',
$pass = '';
/*
Variable for connection
*/
private $connection;
/*
Init method
*/
public function __construct( $params = null ) {
$this -> setConnectionData();
$this -> overwriteSettings( $params );
$connection = $this -> connect();
}
public function setConnectionData() {
if( strpos( $_SERVER['HTTP_HOST'], 'dev' ) ) {
$envVariable = 'development';
} elseif( strpos( $_SERVER['HTTP_HOST'], 'test' ) ) {
$envVariable = 'test';
} elseif( strpos( $_SERVER['HTTP_HOST'], 'review' ) ) {
$envVariable = 'review';
} else {
$envVariable = 'production';
}
$this -> url = $this -> environments[$envVariable]['url'];
$this -> host = $this -> environments[$envVariable]['host'];
$this -> dbname = $this -> environments[$envVariable]['dbname'];
$this -> user = $this -> environments[$envVariable]['user'];
$this -> pass = $this -> environments[$envVariable]['pass'];
}
/*
Overwrite any required values from default
*/
private function overwriteSettings( $params ) {
if( $params ) {
foreach( $params as $key => $val ) {
$this -> $key = $val;
}
}
}
/*
Connect to database and then assign to variable
*/
private function connect() {
$this -> connection = new PDO( sprintf( 'mysql:host=%s;dbname=%s', $this -> host, $this -> dbname ), $this -> user, $this -> pass );
}
public function openQuery( $query, $params = null ) {
if( $params ) {
return $this -> query( $query, $params );
} else {
return $this -> query( $query );
}
}
public function openFetchall( $sth ) {
return $this -> fetchAll( $sth );
}
/*
Runs actual query
*/
protected function query( $query, $params = null ) {
$sth = $this -> connection -> prepare( $query );
if( $params ) {
$sth -> execute( $params );
} else {
$sth -> execute();
}
return $sth;
}
public function openNumRows( $sth ) {
return $this -> numRows( $sth );
}
protected function numRows( $sth ) {
return $sth -> rowCount();
}
public function openFetch( $sth ) {
return $this -> fetch( $sth );
}
protected function fetch( $sth ) {
return $sth -> fetch( PDO::FETCH_ASSOC );
}
protected function fetchAll( $sth ) {
return $sth -> fetchAll( PDO::FETCH_ASSOC );
}
protected function lastId( $sth ) {
return $this -> connection -> lastInsertId();
}
}
?>
现在，当我运行脚本时，出现以下错误：
Fatal error: Call to a member function prepare() on a non-object in /home/content/51/8932751/html/sites/clients/OwnerBusinessLoans/www/dev/lib/helpers/bao.php on line 118
我不明白为什么这样，因为我只是upload以与我所有其他查询相同的方式从类中运行准备好的查询，并且它们运行得很好，并且没有显示此错误。关于语法和我做事的方式，这是我在十多个其他类中所做的方式，而且我从未收到任何错误。
在我的bao课堂上，我确实删除了连接详细信息，但是它们在我测试应用程序的地方。
起初我以为是查询语法或其他什么东西，所以我更改并检查并重新检查了我所有的语法，这看起来还不错。如果是我的PDO实例未定义，我不明白为什么，因为它在所有其他类中都以相同的方式定义并使用相同的方式。
任何帮助将不胜感激，我一直在为此努力，我觉得它必须很小！
谢谢
您的扩展类需要调用父构造函数，以执行bao包括创建数据库连接在内的构造序列。例如...
class upload extends bao {
// snip
public function __construct($params = null) {
parent::__construct($params);
// now the rest of the upload class code
具体参见http://php.net/manual/language.oop5.decon.php
注意：如果子类定义了构造函数，则不会隐式调用父构造函数。为了运行父构造函数，需要在子构造函数内调用parent :: __ construct（）。
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