本文實(shí)例講述了PHP實(shí)現(xiàn)的文件上傳類與用法。分享給大家供大家參考，具體如下：
FileUpload.class.php，其中用到了兩個(gè)常量，可在網(wǎng)站配置文件中定義：define('ROOT_PATH',dirname(__FILE__)); //網(wǎng)站根目錄、define('UPDIR','/uploads/'); //上傳主目錄
<?php
//上傳文件類
class FileUpload {
private $error; //錯(cuò)誤代碼
private $maxsize; //表單最大值
private $type; //類型
private $typeArr = array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif'); //類型合集
private $path; //目錄路徑
private $today; //今天目錄
private $name; //文件名
private $tmp; //臨時(shí)文件
private $linkpath; //鏈接路徑
private $linktotay; //今天目錄（相對(duì)）
//構(gòu)造方法，初始化
public function __construct($_file,$_maxsize) {
$this->error = $_FILES[$_file]['error'];
$this->maxsize = $_maxsize / 1024;
$this->type = $_FILES[$_file]['type'];
$this->path = ROOT_PATH.UPDIR;
$this->linktotay = date('Ymd').'/';
$this->today = $this->path.$this->linktotay;
$this->name = $_FILES[$_file]['name'];
$this->tmp = $_FILES[$_file]['tmp_name'];
$this->checkError();
$this->checkType();
$this->checkPath();
$this->moveUpload();
}
//返回路徑
public function getPath() {
$_path = $_SERVER["SCRIPT_NAME"];
$_dir = dirname(dirname($_path));
if ($_dir == '\\') $_dir = '/';
$this->linkpath = $_dir.$this->linkpath;
return $this->linkpath;
}
//移動(dòng)文件
private function moveUpload() {
if (is_uploaded_file($this->tmp)) {
if (!move_uploaded_file($this->tmp,$this->setNewName())) {
Tool::alertBack('警告：上傳失敗！');
}
} else {
Tool::alertBack('警告：臨時(shí)文件不存在！');
}
}
//設(shè)置新文件名
private function setNewName() {
$_nameArr = explode('.',$this->name);
$_postfix = $_nameArr[count($_nameArr)-1];
$_newname = date('YmdHis').mt_rand(100,1000).'.'.$_postfix;
$this->linkpath = UPDIR.$this->linktotay.$_newname;
return $this->today.$_newname;
}
//驗(yàn)證目錄
private function checkPath() {
if (!is_dir($this->path) || !is_writeable($this->path)) {
if (!mkdir($this->path)) {
Tool::alertBack('警告：主目錄創(chuàng)建失敗！');
}
}
if (!is_dir($this->today) || !is_writeable($this->today)) {
if (!mkdir($this->today)) {
Tool::alertBack('警告：子目錄創(chuàng)建失敗！');
}
}
}
//驗(yàn)證類型
private function checkType() {
if (!in_array($this->type,$this->typeArr)) {
Tool::alertBack('警告：不合法的上傳類型！');
}
}
//驗(yàn)證錯(cuò)誤
private function checkError() {
if (!empty($this->error)) {
switch ($this->error) {
case 1 :
Tool::alertBack('警告：上傳值超過(guò)了約定最大值！');
break;
case 2 :
Tool::alertBack('警告：上傳值超過(guò)了'.$this->maxsize.'KB！');
break;
case 3 :
Tool::alertBack('警告：只有部分文件被上傳！');
break;
case 4 :
Tool::alertBack('警告：沒有任何文件被上傳！');
break;
default:
Tool::alertBack('警告：未知錯(cuò)誤！');
}
}
}
}
?>
其中，用到了一個(gè)靜態(tài)工具類 Tool.class.php，代碼如下：
Tool.class.php
<?php
class Tool {
//彈窗返回
static public function alertBack($_info) {
echo "<script type='text/javascript'>alert('$_info');history.back();</script>";
exit();
} //彈窗賦值關(guān)閉
static public function alertOpenerClose($_info,$_path) {
echo "<script type='text/javascript'>alert('$_info');</script>";
echo "<script type='text/javascript'>opener.document.content.thumbnail.value='$_path';</script>";
echo "<script type='text/javascript'>opener.document.content.pic.style.display='block';</script>";
echo "<script type='text/javascript'>opener.document.content.pic.src='$_path';</script>";
echo "<script type='text/javascript'>window.close();</script>";
exit();
} }
?>
下面進(jìn)行一個(gè)實(shí)例演示，請(qǐng)看下面的步驟：
1、先創(chuàng)建一個(gè) index.php 頁(yè)面，做一個(gè)表單
index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<a target=_blank rel="external nofollow" rel="external nofollow" >http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">
<html xmlns="<a target=_blank rel="external nofollow" rel="external nofollow" >http://www.w3.org/1999/xhtml</a>">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>main</title>
</head>
<body>
<form name="content" method="post" action="?action=add">
<input type="text" name="thumbnail" class="text" readonly="readonly" /> <input type="button" value="上傳" onclick="centerWindow('./upfile.html','upfile','400','100')" /> <img name="pic" style="display:none;" /> ( * 必須是jpg,gif,png，并且200k內(nèi)) <br />
</form>
</body>
</html>
2、創(chuàng)建 upfile.html 文件，建立表單提交到 upload.php.
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