在图片上加文字是论坛，博客，新闻网站上最喜欢用的功能，防止盗图。这里看看代码是如何实现的。

首先还是upload_image.php这个文件，注意这里的caption文本框中输入的内容最终会写到图片上面

<?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';

//设置环境变量

//putenv('GDFONTPATH='.'C:\Windows\Fonts');

$font = "C:\Windows\Fonts\arial.ttf";

//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['uploadfile']['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;

    }

    if(isset($_POST['emb_caption']))

    {

        imagettftext($image , 12 , 0 , 20 , 20 , 0 , $font , $image_caption);

    }

    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="data: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="data: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'];

            if(isset($_POST['emb_caption']))

            {

                $imagename .= '&capt='.urlencode($image_caption);

            }

        }

    ?>

    <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;?>"/>

            Filter:<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 />

            <?php

                echo '<input type="checkbox" name="emb_caption"';

                if(isset($_POST['emb_caption']))

                {

                    echo ' checked="checked"';

                }

                echo ' />Embed caption in image?';

            ?>

            <input type="submit" value="Preview" name="submit" /><br /><br />

            <input type="submit" value="Save" name="submit" />

        </div>

    </form>

<?php

}

?>

注意这里有个问题，选择字体的时要加上绝对路径并且带上后缀.tff，否则的话是看不到图片的，下面的代码是image_effect.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';

//设置环境变量

//putenv('GDFONTPATH='.'C:\Windows\Fonts');

$font = "C:\Windows\Fonts\arial.ttf";

//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['uploadfile']['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;

    }

    if(isset($_POST['emb_caption']))

    {

        imagettftext($image , 12 , 0 , 20 , 20 , 0 , $font , $image_caption);

    }

    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="data: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="data: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'];

            if(isset($_POST['emb_caption']))

            {

                $imagename .= '&capt='.urlencode($image_caption);

            }

        }

    ?>

    <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;?>"/>

            Filter:<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 />

            <?php

                echo '<input type="checkbox" name="emb_caption"';

                if(isset($_POST['emb_caption']))

                {

                    echo ' checked="checked"';

                }

                echo ' />Embed caption in image?';

            ?>

            <input type="submit" value="Preview" name="submit" /><br /><br />

            <input type="submit" value="Save" name="submit" />

        </div>

    </form>

<?php

}

?>

这里如果我们写成下面这样

putenv('GDFONTPATH='.'C:\Windows\Fonts');

$font = "arial";

是看不到效果的，这里顺便提一下，火狐是最佳的开发工具，怎么讲呢，看看下面的对比吧。

火狐的提示是这样的：

图片没有截完整提示是：The image “http://localhost:81/test/image_effect.php?id=31&e=-1&capt=you+are+big+bitch” cannot be displayed because it contains errors.

谷歌浏览器的显示如下：

一个未能正确显示的图片，什么信息都没有。

再来看看大IE的，如下：

也能看到错误信息，但是一大堆乱码啊！

所以说开发人员好帮手还是火狐。

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