这篇文章主要介绍了PHP上传图片类显示缩略图功能的相关资料,重点强调下带有缩鏍图，但是感觉不全面，后续还会继续修改，需要的朋友可以参考下
有缩略图功能 但是 感觉不全面，而且有点问题，继续学习，将来以后修改下
<form action="<?php $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data" method="post" ><input type="text" name="name" /><input type="file" name="file" /><input type="submit" name='submit' value="提交" ></form>
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2016/6/28
* Time: 21:04
*/
class upload{
protected $fileMine;//文件上传类型
protected $filepath;//文件上传路径
protected $filemax;//文件上传大小
protected $fileExt;//文件上传格式
protected $filename;//文件名
protected $fileerror;//文件出错设置
protected $fileflag;//文件检测
protected $fileinfo; //FILES
protected $ext; //文件扩展
protected $path;
//文件上传
public function __construct($filename="file",$filemax=20000000,$filepath="./Uploads",$fileflag=true,$fileExt=array('jpg','exe'),$fileMine=array('image/jpeg'))
{
$this->filename=$filename;
$this->fileinfo=$_FILES[$this->filename];
$this->filemax=$filemax;
$this->filepath=$filepath;
$this->fileflag=$fileflag;
$this->fileExt=$fileExt;
$this->fileMine=$fileMine;
//var_dump($this->filename);
}
//错误判断
public function UpError(){
if($this->fileinfo['error']>0){
switch($this->fileinfo['error'])
{
case 1:
$this->fileerror="上传文件大小超过服务器允许上传的最大值，php.ini中设置upload_max_filesize选项限制的值 ";
break;
case 2:
$this->fileerror="上传文件大小超过HTML表单中隐藏域MAX_FILE_SIZE选项指定的值";
break;
case 3:
$this->fileerror="文件部分被上传";
break;
case 4:
$this->fileerror="没有选择上传文件";
break;
case 5:
$this->fileerror="未找到临时目录";
break;
case 6:
$this->fileerror="文件写入失败";
break;
case 7:
$this->fileerror="php文件上传扩展没有打开 ";
break;
case 8:
$this->fileerror="";
break;
}
return false;
}
return true;
}
//检测文件类型
public function UpMine(){
if(!in_array($this->fileinfo['type'],$this->fileMine)) {
$this->error="文件上传类型不对";
return false;
}
return true;
}
//检测文件格式
public function UpExt(){
$this->ext=pathinfo($this->fileinfo['name'],PATHINFO_EXTENSION);
//var_dump($ext);
if(!in_array($this->ext,$this->fileExt)){
$this->fileerror="文件格式不对";
return false;
}
return true;
}
//检测文件路径
public function UpPath(){
if(!file_exists($this->filepath)){
mkdir($this->filepath,0777,true);
}
}
//检测文件大小
public function UpSize(){
$max=$this->fileinfo['size'];
if($max>$this->filemax){
$this->fileerror="文件过大";
return false;
}
return true;
}
//检测文件是否HTTP
public function UpPost(){
if(!is_uploaded_file($this->fileinfo['tmp_name'])){
$this->fileerror="恶意上偿还";
return false;
}
return true;
}
//文件名防止重复
public function Upname(){
return md5(uniqid(microtime(true),true));
}
//图片缩略图
public function Smallimg($x=100,$y=100){
$imgAtt=getimagesize($this->path);
//图像宽，高，类型
$imgWidth=$imgAtt[0];
$imgHeight=$imgAtt[1];
$imgext=$imgAtt[2];
//等比列缩放
if(($x/$imgWidth)>($y/$imgHeight)){
$bl=$y/$imgHeight;
}else{
$bl=$x/$imgWidth;
}
$x=floor($imgWidth*$bl); //缩放后
$y=floor($imgHeight*$bl);
$images=imagecreatetruecolor($x,$y);
$big=imagecreatefromjpeg($this->path);
imagecopyresized($images,$big,0,0,0,0,$x,$y,$imgWidth,$imgWidth);
switch($imgext){
case 1:
$imageout=imagecreatefromgif($this->path);
break;
case 2:
$imageout=imagecreatefromjpeg($this->path);
break;
case 3:
$imageout=imagecreatefromgif($this->path);
break;
}
$im=imagejpeg($images,$this->path);
}
//文件双传
public function uploads()
{
if($this->UpError()&&$this->UpMine()&&$this->UpExt()&&$this->UpSize()&&$this->UpPost()){
$this->UpPath();
$names=$this->Upname();
$this->path=$this->filepath.'/'. $names.'.'.$this->ext;
if(move_uploaded_file($this->fileinfo['tmp_name'], $this->path)){
return $this->path;
}else{
$this->fileerror="上传失败";
}
}else{
exit("<b>".$this->fileerror."</b>");
}
}
}
<?php
header("content-type:imagejpeg");
header("Content-type:text/html;charset=utf-8");
require 'list.php';
$u=new upload();
$a=$u->uploads();
$c=$u->Smallimg();
echo "<img src={$a} />";
echo "<img src={$c} />";
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
</head>
<body>
<form action="ce.php" enctype="multipart/form-data" method="post" >
<input type="text" name="name" /><input type="file" name="file" />
<input type="submit" name='submit' value="提交" >
</form>
</body>
</html>
以上所述是小编给大家介绍的PHP上传图片类显示缩略图功能的相关知识，希望对大家有所帮助
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