PHP修改图片

这篇是关于修改图片的效果，主要还是用到php中的GD库中的函数，没想到php还有这凶残能力，出乎我的预料。 先看代码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 ="

这篇是关于修改图片的效果，主要还是用到php中的GD库中的函数，没想到php还有这凶残能力，出乎我的预料。

先看代码upload_image.php，主要是一个上传控件，用来选择图片

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

然后是上传和处理图片的逻辑check_image.php

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

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

</span><span>//</span><span>如果是保存图片</span>
<span>if</span>(<span>$_POST</span>['submit'] == 'Save'<span>)
{
    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['id']) && <span>ctype_digit</span>(<span>$_POST</span>['id']) && <span>file_exists</span>(<span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg'<span>))
    {
        </span><span>$image</span> = imagecreatefromjpeg(<span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg'<span>);
    }
    </span><span>else</span><span>
    {
        </span><span>die</span>('invalid image specified'<span>);
    }
    </span><span>$effect</span> = (<span>isset</span>(<span>$_POST</span>['effect'])) ? <span>$_POST</span>['effect'] : -1<span>;
    </span><span>switch</span>(<span>$effect</span><span>)
    {
        </span><span>case</span> IMG_FILTER_NEGATE:<span>
            imagefilter(</span><span>$image</span> , IMG_FILTER_NEGATE);     <span>//</span><span>将图像中所有颜色反转</span>
        <span>break</span><span>;
        </span><span>case</span> IMG_FILTER_GRAYSCALE:<span>
            imagefilter(</span><span>$image</span> , IMG_FILTER_GRAYSCALE);  <span>//</span><span>将图像转换为灰度的</span>
        <span>break</span><span>;
        </span><span>case</span> IMG_FILTER_EMBOSS:<span>
            imagefilter(</span><span>$image</span> , IMG_FILTER_EMBOSS);     <span>//</span><span>使图像浮雕化</span>
        <span>break</span><span>;
        </span><span>case</span> IMG_FILTER_GAUSSIAN_BLUR:<span>
            imagefilter(</span><span>$image</span> , IMG_FILTER_GAUSSIAN_BLUR); <span>//</span><span>用高斯算法模糊图像</span>
        <span>break</span><span>;    
    }
    imagejpeg(</span><span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100<span>);
    </span>?>
    
        
            <title>Here is your pic!</title>
        
        
            <h1 id="Your-image-has-been-saved">Your image has been saved!</h1>
            <img src="images/<?php%20echo%20<span>%24_POST</span>%5B'id'%5D;?>.jpg" alt="">
        
    
<span>php 
}
</span><span>else</span><span>
{
</span>?>
    
        
            <title>Here is your pic!</title>
        
        
            <h1 id="So-how-does-it-feel-to-be-famous">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 <span alt="PHP修改图片" >$imagename</span>;?>" alt=""   style="max-width:90%" />-->
        
    
    <span>php
        </span><span>if</span>(<span>$_POST</span>['submit'] == 'Upload'<span>)
        {
            </span><span>$imagename</span> = 'images/'.<span>$image_id</span>.'.jpg'<span>;
        }
        </span><span>else</span><span>
        {
            </span><span>$imagename</span> = 'image_effect.php?id='.<span>$image_id</span>.'&e='.<span>$_POST</span>['effect'<span>];
        }
    </span>?>
    <img src="<?php%20echo%20<span>%24imagename</span>;?>"   style="max-width:90%" alt="">
    

Image save as:	$image_id?>
Height:	echo $height;?>
Widht:	echo $width;?>
Upload date:	echo $image_date;?>

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 can be undone

None php echo '; if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GRAYSCALE) { echo 'selected="selected"'; } echo ' >Black and white'; echo '; if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GAUSSIAN_BLUR) { echo ' selected="selected"'; } echo '>Blur'; echo '; if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_EMBOSS) { echo 'selected="selected"'; } echo '>Emboss'; echo '; if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_NEGATE) { echo 'selected="selected"'; } echo '>Negative'; ?>

php } ?>

最后是一个预览效果的页面image_effect.php

<span>php 
</span><span>$dir</span> = 'D:\Serious\phpdev\test\images'<span>;

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

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

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

</span>?>

第二个image_check.php有点乱，在这个页面中有上传图片，处理图片，还有预览图片的部分逻辑，注意下面这段

    <span>php
        </span><span>if</span>(<span>$_POST</span>['submit'] == 'Upload'<span>)
        {
            </span><span>$imagename</span> = 'images/'.<span>$image_id</span>.'.jpg'<span>;
        }
        </span><span>else</span><span>
        {
            </span><span>$imagename</span> = 'image_effect.php?id='.<span>$image_id</span>.'&e='.<span>$_POST</span>['effect'<span>];
        }
    </span>?>
    <img src="<?php%20echo%20<span>%24imagename</span>;?>"   style="max-width:90%" alt="">

如果是上传直接访问图片，如果是预览则从image_effect.php中读取图片，这里是从内存中读取图片并根据选择的处理效果来展示图片。如下

<span>switch</span>(<span>$effect</span><span>)
{
    </span><span>case</span> IMG_FILTER_NEGATE:<span>
        imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_NEGATE);
    </span><span>break</span><span>;
    </span><span>case</span> IMG_FILTER_GRAYSCALE:<span>
        imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GRAYSCALE);
    </span><span>break</span><span>;    
    </span><span>case</span> IMG_FILTER_EMBOSS:<span>
        imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_EMBOSS);
    </span><span>break</span><span>;    
    </span><span>case</span> IMG_FILTER_GAUSSIAN_BLUR:<span>
        imagefilter(</span><span>$image</span> ,<span> IMG_FILTER_GAUSSIAN_BLUR);
    </span><span>break</span><span>;    
}</span>

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：

<span>header</span>('Content-Type:image/jpeg'<span>);
imagejpeg(</span><span>$image</span> , '' , 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(<span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100);

注意这里哦我们只写了三种处理效果，这个只是所有枚举中的一部分，我们来看所有的处理方式：

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。

是不是很惊艳，php很强大的。