好得很程序员自学网

<tfoot draggable='sEl'></tfoot>

php网站怎么修改图片

主要还是用到php中的GD库中的函数

upload_image.php，主要是一个上传控件，用来选择图片

<html>
    <head>
   <title></title>
   <style type="text/css"></style>
    </head>
    <body>
   <form action="check_image.php" method="post" enctype="multipart/form-data">
  <table>
 <tr>
<td>Your username</td>
<td><input type="text" name="username" /></td>
 </tr>
 <tr>
<td>Upload image*</td>
<td><input type="file" name="uploadfile"/></td>
 </tr>
 <tr>
<td colspan="2">
    <small><em> * Acceptable image formats include: GIF, JPG/JPEG and PNG.</em></small>
</td>
 </tr>
 <tr>
<td>Image Caption</td>
<td><input type="text" name="caption"/></td>
 </tr>
 <tr>
<td colspan="2" style="text-align:center;">
    <input type="submit" name="submit" value="Upload" />
</td>
 </tr>
  </table>
   </form>
    </body>
</html>

然后是上传和处理图片的逻辑check_image.php

<?php 
//修改图片效果
$db = mysql_connect('localhost','root','Ctrip07185419') or die('can not connect to database');
mysql_select_db('moviesite',$db) or die(mysql_error($db));
//上传文件的路径
$dir = 'D:\Serious\phpdev\test\images';

//upload_image.php页面传递过来的参数，如果是上传图片
if($_POST['submit'] == 'Upload')
{
    if($_FILES['uploadfile']['error'] != UPLOAD_ERR_OK)
    {
   switch($_FILES['uploadfiel']['error'])
   {
  case UPLOAD_ERR_INI_SIZE:
 die('The uploaded file exceeds the upload_max_filesize directive');
  break;
  case UPLOAD_ERR_FORM_SIZE:
 die('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form');
  break;
  case UPLOAD_ERR_PARTIAL:
 die('The uploaded file was only partially uploaded');
  break;
  case UPLOAD_ERR_NO_FILE:
 die('No file was uploaded');
  break;
  case UPLOAD_ERR_NO_TMP_DIR:
 die('The server is missing a temporary folder');
  break;    
  case UPLOAD_ERR_CANT_WRITE:
 die('The server fail to write the uploaded file to the disk');
  break;   
  case UPLOAD_ERR_EXTENSION:
 die('The upload stopped by extension');
  break; 
   }
    }
    $image_caption = $_POST['caption'];
    $image_username = $_POST['username'];
    $image_date = date('Y-m-d');
    list($width,$height,$type,$attr) = getimagesize($_FILES['uploadfile']['tmp_name']);
    $error = 'The file you upload is not a supported filetype';
    switch($type)
    {
   case IMAGETYPE_GIF:
  $image = imagecreatefromgif($_FILES['uploadfile']['tmp_name']) or die($error);
   break;
   case IMAGETYPE_JPEG:
  $image = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']) or die($error);
   break;
   case IMAGETYPE_PNG:
  $image = imagecreatefrompng($_FILES['uploadfile']['tmp_name']) or die($error);
   break;
   default:
   break;
    }
    $query = 'insert into images(image_caption,image_username,image_date) values("'.$image_caption.'" , "'.$image_username.'","'.$image_date.'")';
    $result = mysql_query($query,$db) or die(mysql_error($db));
    $last_id = mysql_insert_id();
    
    // $imagename = $last_id.'.jpg';
    // imagejpeg($image,$dir.'/'.$imagename);
    // imagedestroy($image);
    
    $image_id = $last_id;
    imagejpeg($image , $dir.'/'.$image_id.'.jpg');
    imagedestroy($image);
}
else  //如果图片已经上传，则从数据库中取图片名字
{
    $query = 'select image_id,image_caption,image_username,image_date from images where image_id='.$_POST['id'];
    $result = mysql_query($query,$db) or die(mysql_error($db));
    extract(mysql_fetch_assoc($result));
    list($width,$height,$type,$attr) = getimagesize($dir.'/'.$image_id.'.jpg');
}

//如果是保存图片
if($_POST['submit'] == 'Save')
{
    if(isset($_POST['id']) && ctype_digit($_POST['id']) && file_exists($dir.'/'.$_POST['id'].'.jpg'))
    {
   $image = imagecreatefromjpeg($dir.'/'.$_POST['id'].'.jpg');
    }
    else
    {
   die('invalid image specified');
    }
    $effect = (isset($_POST['effect'])) ? $_POST['effect'] : -1;
    switch($effect)
    {
   case IMG_FILTER_NEGATE:
  imagefilter($image , IMG_FILTER_NEGATE);//将图像中所有颜色反转
   break;
   case IMG_FILTER_GRAYSCALE:
  imagefilter($image , IMG_FILTER_GRAYSCALE);  //将图像转换为灰度的
   break;
   case IMG_FILTER_EMBOSS:
  imagefilter($image , IMG_FILTER_EMBOSS);//使图像浮雕化
   break;
   case IMG_FILTER_GAUSSIAN_BLUR:
  imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR); //用高斯算法模糊图像
   break;    
    }
    imagejpeg($image , $dir.'/'.$_POST['id'].'.jpg' , 100);
    ?>
    <html>
   <head>
  <title>Here is your pic!</title>
   </head>
   <body>
  <h1>Your image has been saved!</h1>
  <img src="images/<?php echo $_POST['id'];?>.jpg" alt="" />
   </body>
    </html>
<?php 
}
else
{
?>
    <html>
   <head>
  <title>Here is your pic!</title>
   </head>
   <body>
  <h1>So how does it feel to be famous?</h1>
  <p>Here is the picture you just uploaded to your servers:</p>
  <!--<img src="images/<?php echo $imagename;?>" alt="" style="float:left;" />-->
   </body>
    </html>
    <?php
   if($_POST['submit'] == 'Upload')
   {
  $imagename = 'images/'.$image_id.'.jpg';
   }
   else
   {
  $imagename = 'image_effect.php?id='.$image_id.'&e='.$_POST['effect'];
   }
    ?>
    <img src="<?php echo $imagename;?>" style="float:left;" alt="" />
    <table>
   <tr>
  <td>Image save as:</td>
  <td><?php $image_id?></td>
   </tr>
   <tr>
  <td>Height:</td>
  <td><?php echo $height;?></td>
   </tr>
   <tr>
  <td>Widht:</td>
  <td><?php echo $width;?></td>
   </tr>
   <tr>
  <td>Upload date:</td>
  <td><?php echo $image_date;?></td>
   </tr>
    </table>
    <p>You may apply a special effect to your image from the list of option below.
    Note:saving an image with any of the filters applied <em>can be undone</em>
    </p>
    <form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
   <div>
  <input type="hidden" name="id" value="<?php echo $image_id;?>"/>
  <select name="effect" id="">
 <option value="-1">None</option>
 <?php 
echo '<option value="'.IMG_FILTER_GRAYSCALE.'" ';
if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GRAYSCALE)
{
    echo 'selected="selected"';
}
echo ' >Black and white</option>';

echo '<option value="'.IMG_FILTER_GAUSSIAN_BLUR.'"';
if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GAUSSIAN_BLUR)
{
    echo ' selected="selected"';
}
echo '>Blur</option>';

echo '<option value="'.IMG_FILTER_EMBOSS.'"';
if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_EMBOSS)
{
    echo 'selected="selected"';
}
echo '>Emboss</option>';

echo '<option value="'.IMG_FILTER_NEGATE.'"';
if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_NEGATE)
{
    echo 'selected="selected"';
}
echo '>Negative</option>';
 ?>
  </select><br />
  <input type="submit" value="Preview" name="submit" /><br />
  <input type="submit" value="Save" name="submit" />
  
   </div>
    </form>
<?php 
}
?>

最后是一个预览效果的页面image_effect.php

<?php 
$dir = 'D:\Serious\phpdev\test\images';

if(isset($_GET['id']) && ctype_digit($_GET['id']) && file_exists($dir.'/'.$_GET['id'].'.jpg'))
{
    $image = imagecreatefromjpeg($dir.'/'.$_GET['id'].'.jpg');
}
else
{
    die('invalid image specified');
}

$effect = (isset($_GET['e'])) ? $_GET['e'] : -1;

switch($effect)
{
    case IMG_FILTER_NEGATE:
   imagefilter($image , IMG_FILTER_NEGATE);
    break;
    case IMG_FILTER_GRAYSCALE:
   imagefilter($image , IMG_FILTER_GRAYSCALE);
    break;    
    case IMG_FILTER_EMBOSS:
   imagefilter($image , IMG_FILTER_EMBOSS);
    break;    
    case IMG_FILTER_GAUSSIAN_BLUR:
   imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR);
    break;    
}
header('Content-Type:image/jpeg');
imagejpeg($image , '' , 100);

?>

当使用imagefilter方法处理图片之后会把图片 输出到页面，这里要注意imagejpeg方法的第二个参数是空字符串，这样它就不会写入到硬盘中了，如果第二个参数设置了会覆盖原有的图片，这样可以让用户在保存图片之前随意的预览效果，如下：

header('Content-Type:image/jpeg');
imagejpeg($image , '' , 100);

在check_image.php中有调用到类似的方法，但是这里指定了第二个参数，就是用来保存图片的：

imagejpeg($image , $dir.'/'.$_POST['id'].'.jpg' , 100);

php中处理图片的方法：

IMG_FILTER_NEGATE：将图像中所有颜色反转。

IMG_FILTER_GRAYSCALE：将图像转换为灰度的。

IMG_FILTER_BRIGHTNESS：改变图像的亮度。用 arg1 设定亮度级别。

IMG_FILTER_CONTRAST：改变图像的对比度。用 arg1 设定对比度级别。

IMG_FILTER_COLORIZE：与 IMG_FILTER_GRAYSCALE 类似，不过可以指定颜色。用 arg1，arg2 和 arg3 分别指定 red，blue 和 green。每种颜色范围是 0 到 255。

IMG_FILTER_EDGEDETECT：用边缘检测来突出图像的边缘。

IMG_FILTER_EMBOSS：使图像浮雕化。

IMG_FILTER_GAUSSIAN_BLUR：用高斯算法模糊图像。

IMG_FILTER_SELECTIVE_BLUR：模糊图像。

IMG_FILTER_MEAN_REMOVAL：用平均移除法来达到轮廓效果。

IMG_FILTER_SMOOTH：使图像更柔滑。用 arg1 设定柔滑级别。

以上就是php网站怎么修改图片的详细内容，更多请关注Gxl网其它相关文章！

查看更多关于php网站怎么修改图片的详细内容...

声明：本文来自网络，不代表【好得很程序员自学网】立场，转载请注明出处：http://haodehen.cn/did58371
  阅读：43次

上一篇： php防sql注入原理

下一篇：php文件手机怎么打开

相关资讯