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首页 > php教程 > php手册 > 正文

php给图片加文字

php中文网
发布： 2016-06-06 19:46:56
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1312人浏览过

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

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

<?<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>设置环境变量
//putenv('GDFONTPATH='.'C:\Windows\Fonts');</span>
<span>$font</span> = "C:\Windows\Fonts\arial.ttf"<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>$_FILES</span>['uploadfile']['error'<span>])
        {
            </span><span>case</span> UPLOAD_ERR_INI_SIZE:
                <span>die</span>('The uploaded file exceeds the upload_max_filesize directive'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_FORM_SIZE:
                <span>die</span>('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_PARTIAL:
                <span>die</span>('The uploaded file was only partially uploaded'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_NO_FILE:
                <span>die</span>('No file was uploaded'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_NO_TMP_DIR:
                <span>die</span>('The server is missing a temporary folder'<span>);
            </span><span>break</span><span>;    
            </span><span>case</span> UPLOAD_ERR_CANT_WRITE:
                <span>die</span>('The server fail to write the uploaded file to the disk'<span>);
            </span><span>break</span><span>;        
            </span><span>case</span> UPLOAD_ERR_EXTENSION:
                <span>die</span>('The upload stopped by extension'<span>);
            </span><span>break</span><span>;                
        }
    }
    </span><span>$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>;    
    }
    
    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
    {
        imagettftext(</span><span>$image</span> , 12 , 0 , 20 , 20 , 0 , <span>$font</span> , <span>$image_caption</span><span>);
    }
    
    imagejpeg(</span><span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100<span>);
    </span>?>
    <html>
        <head>
            <title>Here is your pic!</title>
        </head>
        <body>
            <h1>Your image has been saved!</h1>
            @@##@@$_POST</span>['id'];?>.jpg" alt="" />
        </body>
    </html>
<?<span>php 
}
</span><span>else</span><span>
{
</span>?>
    <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><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/7fc7563c4182" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">PHP免费学习笔记（深入）</a>”；</p>
            <!--@@##@@$imagename</span>;?>" alt="" style="float:left;" />-->
        </body>
    </html>
    <?<span>php
        </span><span>if</span>(<span>$_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>$_POST</span>['effect'<span>];
            </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
            {
                </span><span>$imagename</span> .= '&capt='.<span>urlencode</span>(<span>$image_caption</span><span>);
            }
        }
    </span>?>
    @@##@@$imagename</span>;?>" style="float:left;" alt="" />
    <table>
        <tr>
            <td>Image save <span>as</span>:</td>
            <td><?php <span>$image_id</span>?></td>
        </tr>
        <tr>
            <td>Height:</td>
            <td><?php <span>echo</span> <span>$height</span>;?></td>
        </tr>
        <tr>
            <td>Widht:</td>
            <td><?php <span>echo</span> <span>$width</span>;?></td>
        </tr>
        <tr>
            <td>Upload <span>date</span>:</td>
            <td><?php <span>echo</span> <span>$image_date</span>;?></td>
        </tr>
    </table>
    <p>You may apply a special effect to your image from the <span>list</span> of option below.<span>
    Note</span>:saving an image with any of the filters applied <em>can be undone</em>
    </p>
    <form action="<?php echo <span>$_SERVER</span>['PHP_SELF'];?>" method="post">
        <div>
            <input type="hidden" name="id" value="<?php echo <span>$image_id</span>;?>"/><span>
            Filter</span>:<select name="effect" id="">
                <option value="-1">None</option>
                <?<span>php 
                    </span><span>echo</span> '<option value="'.IMG_FILTER_GRAYSCALE.'" '<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_GRAYSCALE)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> ' >Black and white</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_GAUSSIAN_BLUR.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_GAUSSIAN_BLUR)
                    {
                        </span><span>echo</span> ' selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Blur</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_EMBOSS.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_EMBOSS)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Emboss</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_NEGATE.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_NEGATE)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Negative</option>'<span>;
                </span>?>
            </select><br />
            <?<span>php 
                </span><span>echo</span> '<input type="checkbox" name="emb_caption"'<span>;
                </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
                {
                    </span><span>echo</span> ' checked="checked"'<span>;
                }
                </span><span>echo</span> ' />Embed caption in image?'<span>;
            </span>?>
            <input type="submit" value="Preview" name="submit" /><br /><br />
            <input type="submit" value="Save" name="submit" />
            
        </div>
    </form>
<?<span>php 
}
</span>?>
登录后复制

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

<?<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>设置环境变量
//putenv('GDFONTPATH='.'C:\Windows\Fonts');</span>
<span>$font</span> = "C:\Windows\Fonts\arial.ttf"<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>$_FILES</span>['uploadfile']['error'<span>])
        {
            </span><span>case</span> UPLOAD_ERR_INI_SIZE:
                <span>die</span>('The uploaded file exceeds the upload_max_filesize directive'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_FORM_SIZE:
                <span>die</span>('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_PARTIAL:
                <span>die</span>('The uploaded file was only partially uploaded'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_NO_FILE:
                <span>die</span>('No file was uploaded'<span>);
            </span><span>break</span><span>;
            </span><span>case</span> UPLOAD_ERR_NO_TMP_DIR:
                <span>die</span>('The server is missing a temporary folder'<span>);
            </span><span>break</span><span>;    
            </span><span>case</span> UPLOAD_ERR_CANT_WRITE:
                <span>die</span>('The server fail to write the uploaded file to the disk'<span>);
            </span><span>break</span><span>;        
            </span><span>case</span> UPLOAD_ERR_EXTENSION:
                <span>die</span>('The upload stopped by extension'<span>);
            </span><span>break</span><span>;                
        }
    }
    </span><span>$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>;    
    }
    
    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
    {
        imagettftext(</span><span>$image</span> , 12 , 0 , 20 , 20 , 0 , <span>$font</span> , <span>$image_caption</span><span>);
    }
    
    imagejpeg(</span><span>$image</span> , <span>$dir</span>.'/'.<span>$_POST</span>['id'].'.jpg' , 100<span>);
    </span>?>
    <html>
        <head>
            <title>Here is your pic!</title>
        </head>
        <body>
            <h1>Your image has been saved!</h1>
            @@##@@$_POST</span>['id'];?>.jpg" alt="" />
        </body>
    </html>
<?<span>php 
}
</span><span>else</span><span>
{
</span>?>
    <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><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/7fc7563c4182" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">PHP免费学习笔记（深入）</a>”；</p>
            <!--@@##@@$imagename</span>;?>" alt="" style="float:left;" />-->
        </body>
    </html>
    <?<span>php
        </span><span>if</span>(<span>$_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>$_POST</span>['effect'<span>];
            </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
            {
                </span><span>$imagename</span> .= '&capt='.<span>urlencode</span>(<span>$image_caption</span><span>);
            }
        }
    </span>?>
    @@##@@$imagename</span>;?>" style="float:left;" alt="" />
    <table>
        <tr>
            <td>Image save <span>as</span>:</td>
            <td><?php <span>$image_id</span>?></td>
        </tr>
        <tr>
            <td>Height:</td>
            <td><?php <span>echo</span> <span>$height</span>;?></td>
        </tr>
        <tr>
            <td>Widht:</td>
            <td><?php <span>echo</span> <span>$width</span>;?></td>
        </tr>
        <tr>
            <td>Upload <span>date</span>:</td>
            <td><?php <span>echo</span> <span>$image_date</span>;?></td>
        </tr>
    </table>
    <p>You may apply a special effect to your image from the <span>list</span> of option below.<span>
    Note</span>:saving an image with any of the filters applied <em>can be undone</em>
    </p>
    <form action="<?php echo <span>$_SERVER</span>['PHP_SELF'];?>" method="post">
        <div>
            <input type="hidden" name="id" value="<?php echo <span>$image_id</span>;?>"/><span>
            Filter</span>:<select name="effect" id="">
                <option value="-1">None</option>
                <?<span>php 
                    </span><span>echo</span> '<option value="'.IMG_FILTER_GRAYSCALE.'" '<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_GRAYSCALE)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> ' >Black and white</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_GAUSSIAN_BLUR.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_GAUSSIAN_BLUR)
                    {
                        </span><span>echo</span> ' selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Blur</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_EMBOSS.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_EMBOSS)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Emboss</option>'<span>;
                    
                    </span><span>echo</span> '<option value="'.IMG_FILTER_NEGATE.'"'<span>;
                    </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['effect']) && <span>$_POST</span>['effect'] ==<span> IMG_FILTER_NEGATE)
                    {
                        </span><span>echo</span> 'selected="selected"'<span>;
                    }
                    </span><span>echo</span> '>Negative</option>'<span>;
                </span>?>
            </select><br />
            <?<span>php 
                </span><span>echo</span> '<input type="checkbox" name="emb_caption"'<span>;
                </span><span>if</span>(<span>isset</span>(<span>$_POST</span>['emb_caption'<span>]))
                {
                    </span><span>echo</span> ' checked="checked"'<span>;
                }
                </span><span>echo</span> ' />Embed caption in image?'<span>;
            </span>?>
            <input type="submit" value="Preview" name="submit" /><br /><br />
            <input type="submit" value="Save" name="submit" />
            
        </div>
    </form>
<?<span>php 
}
</span>?>
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这里如果我们写成下面这样

Imagine By Magic Studio
Imagine By Magic Studio

AI图片生成器，用文字制作图片

Imagine By Magic Studio 115
查看详情 Imagine By Magic Studio 

<span>putenv</span>('GDFONTPATH='.'C:\Windows\Fonts'<span>);
</span><span>$font</span> = "arial";
登录后复制

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：

php给图片加文字

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：

php给图片加文字php给图片加文字php给图片加文字php给图片加文字php给图片加文字

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