php图片水印添加,压缩,剪切类的封装
Jul 30, 2016 pm 01:31 PMphp对图片文件的操作主要是利用GD库扩展。当我们频繁利用php对图片进行操作时,会自然封装很多函数,否则会写太多重复的代码。当有很多对图片的相关函数的时候,我们可以考虑将这些函数也整理一下,因而就有了封装成类的想法。
操作图片主要历经四个步骤:
- 打开图片
- 操作图片
- 输出图片
- 销毁图片
1,3,4三个步骤每次都要写,每次又都差不多。真正需要变通的只有操作图片的这一步骤了。操作图片又往往通过1或多个主要的GD函数来完成。
本文封装类里面的四种方法,文字水印(imagettftext()),图片水印(imagecopymerge()),图片压缩,图片剪切(imagecopyresampled()),其余的常用GD函数便不赘述。直接上代码:
<span>php </span><span>class</span><span> Image { </span><span>private</span><span> $info; </span><span>private</span><span> $image; </span><span>public</span><span> $type; </span><span>public</span><span> function __construct($src) { $</span><span>this</span>->info=<span>getimagesize($src); $</span><span>this</span>->type=image_type_to_extension($<span>this</span>->info[<span>'</span><span>2</span><span>'</span>],<span>false</span><span>); $fun</span>=<span>"</span><span>imagecreatefrom{$this->type}</span><span>"</span><span>; $</span><span>this</span>->image=<span>$fun($src); } </span><span>/*</span><span>* * 文字水印 * @param [type] $font 字体 * @param [type] $content 内容 * @param [type] $size 文字大小 * @param [type] $col 文字颜色(四元数组) * @param array $location 位置 * @param integer $angle 倾斜角度 * @return [type] </span><span>*/</span><span>public</span> function fontMark($font,$content,$size,$col,$location,$angle=<span>0</span><span>){ $col</span>=imagecolorallocatealpha($<span>this</span>->image, $col[<span>'</span><span>0</span><span>'</span>], $col[<span>'</span><span>1</span><span>'</span>], $col[<span>'</span><span>2</span><span>'</span>],$col[<span>'</span><span>3</span><span>'</span><span>]); imagettftext($</span><span>this</span>->image, $size, $angle, $location[<span>'</span><span>0</span><span>'</span>], $location[<span>'</span><span>1</span><span>'</span><span>], $col,$font,$content); } </span><span>/*</span><span>* * 图片水印 * @param [type] $imageMark 水印图片地址 * @param [type] $dst 水印图片在原图片中的位置 * @param [type] $pct 透明度 * @return [type] </span><span>*/</span><span>public</span><span> function imageMark($imageMark,$dst,$pct){ $info2</span>=<span>getimagesize($imageMark); $type</span>=image_type_to_extension($info2[<span>'</span><span>2</span><span>'</span>],<span>false</span><span>); $func2</span>=<span>"</span><span>imagecreatefrom</span><span>"</span><span>.$type; $water</span>=<span>$func2($imageMark); imagecopymerge($</span><span>this</span>->image, $water, $dst[<span>0</span>], $dst[<span>1</span>], <span>0</span>, <span>0</span>, $info2[<span>'</span><span>0</span><span>'</span>], $info2[<span>'</span><span>1</span><span>'</span><span>], $pct); imagedestroy($water); } </span><span>/*</span><span>* * 压缩图片 * @param [type] $thumbSize 压缩图片大小 * @return [type] [description] </span><span>*/</span><span>public</span><span> function thumb($thumbSize){ $imageThumb</span>=imagecreatetruecolor($thumbSize[<span>0</span>], $thumbSize[<span>1</span><span>]); imagecopyresampled($imageThumb, $</span><span>this</span>->image, <span>0</span>, <span>0</span>, <span>0</span>, <span>0</span>, $thumbSize[<span>0</span>], $thumbSize[<span>1</span>], $<span>this</span>->info[<span>'</span><span>0</span><span>'</span>], $<span>this</span>->info[<span>'</span><span>1</span><span>'</span><span>]); imagedestroy($</span><span>this</span>-><span>image); $</span><span>this</span>->image=<span>$imageThumb; } </span><span>/*</span><span>* * 裁剪图片 * @param [type] $cutSize 裁剪大小 * @param [type] $location 裁剪位置 * @return [type] [description] </span><span>*/</span><span>public</span><span> function cut($cutSize,$location){ $imageCut</span>=imagecreatetruecolor($cutSize[<span>0</span>],$cutSize[<span>1</span><span>]); imagecopyresampled($imageCut, $</span><span>this</span>->image, <span>0</span>, <span>0</span>, $location[<span>0</span>], $location[<span>1</span>],$cutSize[<span>0</span>],$cutSize[<span>1</span>],$cutSize[<span>0</span>],$cutSize[<span>1</span><span>]); imagedestroy($</span><span>this</span>-><span>image); $</span><span>this</span>->image=<span>$imageCut; } </span><span>/*</span><span>* * 展现图片 * @return [type] [description] </span><span>*/</span><span>public</span><span> function show(){ header(</span><span>"</span><span>content-type:</span><span>"</span>.$<span>this</span>->info[<span>'</span><span>mime</span><span>'</span><span>]); $funn</span>=<span>"</span><span>image</span><span>"</span>.$<span>this</span>-><span>type; $funn($</span><span>this</span>-><span>image); } </span><span>/*</span><span>* * 保存图片 * @param [type] $newname 新图片名 * @return [type] [description] </span><span>*/</span><span>public</span><span> function save($newname){ header(</span><span>"</span><span>content-type:</span><span>"</span>.$<span>this</span>->info[<span>'</span><span>mime</span><span>'</span><span>]); $funn</span>=<span>"</span><span>image</span><span>"</span>.$<span>this</span>-><span>type; $funn($</span><span>this</span>->image,$newname.<span>'</span><span>.</span><span>'</span>.$<span>this</span>-><span>type); } </span><span>public</span><span> function __destruct(){ imagedestroy($</span><span>this</span>-><span>image); } } </span>?>
如果还需要其他操作,只需要再往这个类里面添加就好啦~~
以上就介绍了php图片水印添加,压缩,剪切类的封装,包括了方面的内容,希望对PHP教程有兴趣的朋友有所帮助。

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