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Home  >  Article  >  Backend Development  >  How to modify pictures on php website

How to modify pictures on php website

尚
尚Original
2019-10-26 13:29:283737browse

How to modify pictures on php website

Mainly uses the function in the GD library in php

upload_image.php, which is mainly an upload control used to select images 

<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>

Then there is the logic of uploading and processing images check_image.php

<?php 
//修改图片效果
$db = mysql_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;Ctrip07185419&#39;) or die(&#39;can not connect to database&#39;);
mysql_select_db(&#39;moviesite&#39;,$db) or die(mysql_error($db));
//上传文件的路径
$dir = &#39;D:\Serious\phpdev\test\images&#39;;

//upload_image.php页面传递过来的参数，如果是上传图片
if($_POST[&#39;submit&#39;] == &#39;Upload&#39;)
{
    if($_FILES[&#39;uploadfile&#39;][&#39;error&#39;] != UPLOAD_ERR_OK)
    {
        switch($_FILES[&#39;uploadfiel&#39;][&#39;error&#39;])
        {
            case UPLOAD_ERR_INI_SIZE:
                die(&#39;The uploaded file exceeds the upload_max_filesize directive&#39;);
            break;
            case UPLOAD_ERR_FORM_SIZE:
                die(&#39;The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form&#39;);
            break;
            case UPLOAD_ERR_PARTIAL:
                die(&#39;The uploaded file was only partially uploaded&#39;);
            break;
            case UPLOAD_ERR_NO_FILE:
                die(&#39;No file was uploaded&#39;);
            break;
            case UPLOAD_ERR_NO_TMP_DIR:
                die(&#39;The server is missing a temporary folder&#39;);
            break;    
            case UPLOAD_ERR_CANT_WRITE:
                die(&#39;The server fail to write the uploaded file to the disk&#39;);
            break;        
            case UPLOAD_ERR_EXTENSION:
                die(&#39;The upload stopped by extension&#39;);
            break;                
        }
    }
    $image_caption = $_POST[&#39;caption&#39;];
    $image_username = $_POST[&#39;username&#39;];
    $image_date = date(&#39;Y-m-d&#39;);
    list($width,$height,$type,$attr) = getimagesize($_FILES[&#39;uploadfile&#39;][&#39;tmp_name&#39;]);
    $error = &#39;The file you upload is not a supported filetype&#39;;
    switch($type)
    {
        case IMAGETYPE_GIF:
            $image = imagecreatefromgif($_FILES[&#39;uploadfile&#39;][&#39;tmp_name&#39;]) or die($error);
        break;
        case IMAGETYPE_JPEG:
            $image = imagecreatefromjpeg($_FILES[&#39;uploadfile&#39;][&#39;tmp_name&#39;]) or die($error);
        break;
        case IMAGETYPE_PNG:
            $image = imagecreatefrompng($_FILES[&#39;uploadfile&#39;][&#39;tmp_name&#39;]) or die($error);
        break;
        default:
        break;
    }
    $query = &#39;insert into images(image_caption,image_username,image_date) values("&#39;.$image_caption.&#39;" , "&#39;.$image_username.&#39;","&#39;.$image_date.&#39;")&#39;;
    $result = mysql_query($query,$db) or die(mysql_error($db));
    $last_id = mysql_insert_id();
    
    // $imagename = $last_id.&#39;.jpg&#39;;
    // imagejpeg($image,$dir.&#39;/&#39;.$imagename);
    // imagedestroy($image);
    
    $image_id = $last_id;
    imagejpeg($image , $dir.&#39;/&#39;.$image_id.&#39;.jpg&#39;);
    imagedestroy($image);
}
else  //如果图片已经上传，则从数据库中取图片名字
{
    $query = &#39;select image_id,image_caption,image_username,image_date from images where image_id=&#39;.$_POST[&#39;id&#39;];
    $result = mysql_query($query,$db) or die(mysql_error($db));
    extract(mysql_fetch_assoc($result));
    list($width,$height,$type,$attr) = getimagesize($dir.&#39;/&#39;.$image_id.&#39;.jpg&#39;);
}

//如果是保存图片
if($_POST[&#39;submit&#39;] == &#39;Save&#39;)
{
    if(isset($_POST[&#39;id&#39;]) && ctype_digit($_POST[&#39;id&#39;]) && file_exists($dir.&#39;/&#39;.$_POST[&#39;id&#39;].&#39;.jpg&#39;))
    {
        $image = imagecreatefromjpeg($dir.&#39;/&#39;.$_POST[&#39;id&#39;].&#39;.jpg&#39;);
    }
    else
    {
        die(&#39;invalid image specified&#39;);
    }
    $effect = (isset($_POST[&#39;effect&#39;])) ? $_POST[&#39;effect&#39;] : -1;
    switch($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 , $dir.&#39;/&#39;.$_POST[&#39;id&#39;].&#39;.jpg&#39; , 100);
    ?>
    <html>
        <head>
            <title>Here is your pic!</title>
        </head>
        <body>
            <h1>Your image has been saved!</h1>
            <img src="images/<?php echo $_POST[&#39;id&#39;];?>.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[&#39;submit&#39;] == &#39;Upload&#39;)
        {
            $imagename = &#39;images/&#39;.$image_id.&#39;.jpg&#39;;
        }
        else
        {
            $imagename = &#39;image_effect.php?id=&#39;.$image_id.&#39;&e=&#39;.$_POST[&#39;effect&#39;];
        }
    ?>
    <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[&#39;PHP_SELF&#39;];?>" method="post">
        <div>
            <input type="hidden" name="id" value="<?php echo $image_id;?>"/>
            <select name="effect" id="">
                <option value="-1">None</option>
                <?php 
                    echo &#39;<option value="&#39;.IMG_FILTER_GRAYSCALE.&#39;" &#39;;
                    if(isset($_POST[&#39;effect&#39;]) && $_POST[&#39;effect&#39;] == IMG_FILTER_GRAYSCALE)
                    {
                        echo &#39;selected="selected"&#39;;
                    }
                    echo &#39; >Black and white</option>&#39;;
                    
                    echo &#39;<option value="&#39;.IMG_FILTER_GAUSSIAN_BLUR.&#39;"&#39;;
                    if(isset($_POST[&#39;effect&#39;]) && $_POST[&#39;effect&#39;] == IMG_FILTER_GAUSSIAN_BLUR)
                    {
                        echo &#39; selected="selected"&#39;;
                    }
                    echo &#39;>Blur</option>&#39;;
                    
                    echo &#39;<option value="&#39;.IMG_FILTER_EMBOSS.&#39;"&#39;;
                    if(isset($_POST[&#39;effect&#39;]) && $_POST[&#39;effect&#39;] == IMG_FILTER_EMBOSS)
                    {
                        echo &#39;selected="selected"&#39;;
                    }
                    echo &#39;>Emboss</option>&#39;;
                    
                    echo &#39;<option value="&#39;.IMG_FILTER_NEGATE.&#39;"&#39;;
                    if(isset($_POST[&#39;effect&#39;]) && $_POST[&#39;effect&#39;] == IMG_FILTER_NEGATE)
                    {
                        echo &#39;selected="selected"&#39;;
                    }
                    echo &#39;>Negative</option>&#39;;
                ?>
            </select><br />
            <input type="submit" value="Preview" name="submit" /><br />
            <input type="submit" value="Save" name="submit" />
            
        </div>
    </form>
<?php 
}
?>

Finally there is a preview effect page image_effect.php

<?php 
$dir = &#39;D:\Serious\phpdev\test\images&#39;;

if(isset($_GET[&#39;id&#39;]) && ctype_digit($_GET[&#39;id&#39;]) && file_exists($dir.&#39;/&#39;.$_GET[&#39;id&#39;].&#39;.jpg&#39;))
{
    $image = imagecreatefromjpeg($dir.&#39;/&#39;.$_GET[&#39;id&#39;].&#39;.jpg&#39;);
}
else
{
    die(&#39;invalid image specified&#39;);
}

$effect = (isset($_GET[&#39;e&#39;])) ? $_GET[&#39;e&#39;] : -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($image , IMG_FILTER_GAUSSIAN_BLUR);
    break;    
}
header(&#39;Content-Type:image/jpeg&#39;);
imagejpeg($image , &#39;&#39; , 100);

?>

When the image filter method is used to process the image, the image will be output to the page. It should be noted here that the second parameter of the imagejpeg method is an empty string, so that it will not be written to the hard disk. If the second parameter is set, the original image will be overwritten, which allows the user to freely save the image before saving it. The preview effect is as follows: 

header(&#39;Content-Type:image/jpeg&#39;);
imagejpeg($image , &#39;&#39; , 100);

A similar method is called in check_image.php, but the second parameter is specified here, which is used to save the image: 

imagejpeg($image , $dir.&#39;/&#39;.$_POST[&#39;id&#39;].&#39;.jpg&#39; , 100);

php Methods for processing images:

IMG_FILTER_NEGATE: Invert all colors in the image.

IMG_FILTER_GRAYSCALE: Convert the image to grayscale.

IMG_FILTER_BRIGHTNESS: Change the brightness of the image. Use arg1 to set the brightness level.

IMG_FILTER_CONTRAST: Change the contrast of the image. Use arg1 to set the contrast level.

IMG_FILTER_COLORIZE: Similar to IMG_FILTER_GRAYSCALE, but the color can be specified. Use arg1, arg2 and arg3 to specify red, blue and green respectively. Each color range is 0 to 255.

IMG_FILTER_EDGEDETECT: Use edge detection to highlight the edges of the image.

IMG_FILTER_EMBOSS: Make the image embossed.

IMG_FILTER_GAUSSIAN_BLUR: Blur the image using Gaussian algorithm.

IMG_FILTER_SELECTIVE_BLUR: Blur the image.

IMG_FILTER_MEAN_REMOVAL: Use the average removal method to achieve the outline effect.

IMG_FILTER_SMOOTH: Make the image smoother. Use arg1 to set the smoothness level.

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