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php上传图片学习笔记与心得

Jun 13, 2016 am 10:16 AM
file php upload and use variable picture exist study Experience us document notes automatic this

我们在php中上传文件就必须使用#_FILE变量了,这个自动全局变量 $_FILES 从 PHP 4.1.0 版本开始被支持。在这之前,从 4.0.0 版本开始,PHP 支持 $HTTP_POST_FILES 数组。这些数组将包含所有关于您上传的文件的信息,其中,我们推荐您使用 $_FILES。

如果 PHP 的设置选项 register_globals 为 on,则相关的变量名将也会存在。从 PHP 4.2.0 版本开始,register_globals 的默认值被设为 off。

我们假设文件上传字段的名称为 userfile。名称可随意命名。

$_FILES['userfile']['name']
客户端机器文件的原名称。

$_FILES['userfile']['type']
文件的 MIME 类型,需要浏览器提供该信息的支持,例如“image/gif”。

$_FILES['userfile']['size']
已上传文件的大小,单位为字节。

$_FILES['userfile']['tmp_name']
文件被上传后在服务端储存的临时文件名。

$_FILES['userfile']['error']
和该文件上传相关的错误代码。['error'] 是在 PHP 4.2.0 版本中增加的。

处理函数:

move_uploaded_file()
(PHP 4 >= 4.0.3, PHP 5)

move_uploaded_file -- 将上传的文件移动到新位置

说明
bool move_uploaded_file ( string filename, string destination )

本函数检查并确保由 filename 指定的文件是合法的上传文件(即通过 PHP 的 HTTP POST 上传机制所上传的)。如果文件合法,则将其移动为由 destination 指定的文件。

如果 filename 不是合法的上传文件,不会出现任何操作,move_uploaded_file() 将返回 FALSE。

如果 filename 是合法的上传文件,但出于某些原因无法移动,不会出现任何操作,move_uploaded_file() 将返回 FALSE。此外还会发出一条警告。

如果目标文件已经存在,将会被覆盖。

示例:

 代码如下 复制代码
if(move_uploaded_file($_FILES["magfile"]["tmp_name"], $uploaddir))
  {
    echo "Update OK!";
  }

也可用copy(PHP 3, PHP 4, PHP 5)
copy -- 拷贝文件
bool copy ( string source, string dest )

将文件从 source 拷贝到 dest。如果成功则返回 TRUE,失败则返回 FALSE。

提交页:

 代码如下 复制代码

 
 
accept="image/x-png,image/gif,image/jpeg"> 
 

处理页:

 代码如下 复制代码

    if($_FILES['picurl']['size'] > 0){
      if(move_uploaded_file ($_FILES['picurl']['tmp_name'], $_FILES['picurl']['name'])){
        echo "图片上传成功";
      }
    }

其它非File类型的表单,可照样用$_POST['name']来接收。

php上传图片简单实现

 代码如下 复制代码
 
 
PHP上传图片简单实现  
 
 
if($_GET['action'] == 'upfile') 

$target_path = 'temp_'.$_FILES['photo']['name']; 
echo '上传的临时文件:' .$_FILES['photo']['tmp_name'] . '
';
echo '上传的目标文件:' .$target_path . '
';
echo $_SERVER["SCRIPT_FILENAME"] . '
';
echo $_SERVER["OS"] . '
';
//测试函数: move_uploaded_file
//也可以用函数:copy
move_uploaded_file($_FILES['photo']['tmp_name'], $target_path); 
echo "Upload result:"; 
if(file_exists($target_path)) { 
 if($_SERVER["OS"]!="Windows_NT"){
  @chmod($target_path,0604);
 }
 echo 'Succeed!
php上传图片学习笔记与心得'; 
} else { 
 echo 'Failed!'; 

exit; 

?> 

Registration

 
 
 
Your information 
     
  • Your Phot
  •  
 
 
 
 
 

上面代码只适用于学习使用,如果想使用在现在的服务器上我们必须如下写法

 代码如下 复制代码

/******************************************************************************

参数说明:
$max_file_size  : 上传文件大小限制, 单位BYTE
$destination_folder : 上传文件路径
$watermark   : 是否附加水印(1为加水印,其他为不加水印);

使用说明:
1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
2. 将extension_dir =改为你的php_gd2.dll所在目录;
******************************************************************************/

//上传文件类型列表
$uptypes=array(
    'image/jpg',
    'image/jpeg',
    'image/png',
    'image/pjpeg',
    'image/gif',
    'image/bmp',
    'image/x-png'
);

$max_file_size=2000000;     //上传文件大小限制, 单位BYTE
$destination_folder="uploadimg/"; //上传文件路径
$watermark=1;      //是否附加水印(1为加水印,其他为不加水印);
$watertype=1;      //水印类型(1为文字,2为图片)
$waterposition=1;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
$waterstring="http://www.bKjia.c0m/";  //水印字符串
$waterimg="xplore.gif";    //水印图片
$imgpreview=1;      //是否生成预览图(1为生成,其他为不生成);
$imgpreviewsize=1/2;    //缩略图比例
?>


ZwelL图片上传程序



  上传文件:
 
 

  允许上传的文件类型为:=implode(', ',$uptypes)?>

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    if (!is_uploaded_file($_FILES["upfile"][tmp_name]))
    //是否存在文件
    {
         echo "图片不存在!";
         exit;
    }

    $file = $_FILES["upfile"];
    if($max_file_size     //检查文件大小
    {
        echo "文件太大!";
        exit;
    }

    if(!in_array($file["type"], $uptypes))
    //检查文件类型
    {
        echo "文件类型不符!".$file["type"];
        exit;
    }

    if(!file_exists($destination_folder))
    {
        mkdir($destination_folder);
    }

    $filename=$file["tmp_name"];
    $image_size = getimagesize($filename);
    $pinfo=pathinfo($file["name"]);
    $ftype=$pinfo['extension'];
    $destination = $destination_folder.time().".".$ftype;
    if (file_exists($destination) && $overwrite != true)
    {
        echo "同名文件已经存在了";
        exit;
    }

    if(!move_uploaded_file ($filename, $destination))
    {
        echo "移动文件出错";
        exit;
    }

    $pinfo=pathinfo($destination);
    $fname=$pinfo[basename];
    echo " 已经成功上传
文件名:  ".$destination_folder.$fname."
";
    echo " 宽度:".$image_size[0];
    echo " 长度:".$image_size[1];
    echo "
大小:".$file["size"]." bytes";

    if($watermark==1)
    {
        $iinfo=getimagesize($destination,$iinfo);
        $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
        $white=imagecolorallocate($nimage,255,255,255);
        $black=imagecolorallocate($nimage,0,0,0);
        $red=imagecolorallocate($nimage,255,0,0);
        imagefill($nimage,0,0,$white);
        switch ($iinfo[2])
        {
            case 1:
            $simage =imagecreatefromgif($destination);
            break;
            case 2:
            $simage =imagecreatefromjpeg($destination);
            break;
            case 3:
            $simage =imagecreatefrompng($destination);
            break;
            case 6:
            $simage =imagecreatefromwbmp($destination);
            break;
            default:
            die("不支持的文件类型");
            exit;
        }

        imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
        imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);

        switch($watertype)
        {
            case 1:   //加水印字符串
            imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
            break;
            case 2:   //加水印图片
            $simage1 =imagecreatefromgif("xplore.gif");
            imagecopy($nimage,$simage1,0,0,0,0,85,15);
            imagedestroy($simage1);
            break;
        }

        switch ($iinfo[2])
        {
            case 1:
            //imagegif($nimage, $destination);
            imagejpeg($nimage, $destination);
            break;
            case 2:
            imagejpeg($nimage, $destination);
            break;
            case 3:
            imagepng($nimage, $destination);
            break;
            case 6:
            imagewbmp($nimage, $destination);
            //imagejpeg($nimage, $destination);
            break;
        }

        //覆盖原上传文件
        imagedestroy($nimage);
        imagedestroy($simage);
    }

    if($imgpreview==1)
    {
    echo "
图片预览:
";
    echo "图片预览:r文件名:";
    }
}
?>

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