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HomeBackend DevelopmentPHP TutorialPHPThumb PHP 图片缩略图库_PHP

1、这是一个缩略图类库
它是一个开源的图片缩略图类库,可以完成多种复杂的图片缩略图生成和现实,使用起来非常的方便。

2、使用方法
这里有一篇关于其简单实用的说明,英文比较简单,就不翻译了:

Basic-Usage

3、API
这里有一个API列表:

PHPThumb API

不过非常可惜,API中并没有任何说明,只能对照其英文名称猜测其效果,当然即使猜对了,也要测试下看看是否是正确的。

4、样例
这里我也写了个简单调用它的方法,不过我是把该图片保存成为文件了,basic-usage中的例子全是直接在页面中输出的:
复制代码 代码如下:
require_once 'phpthumb/ThumbLib.inc.php';
try {
$thumb = PhpThumbFactory::create($realpath);
} catch (Exception $e) {
// handle error here however you'd like
}
$thumb->adaptiveResize($width, $height);
$thumb->save($realpath . '.' . $width . 'x' . $height . '.png');

5、我用到的几个API
使用过程中,对几个API的理解逐渐加深,这里记录下:

resize ($maxWidth, $maxHeight)

resize方法是最常用的缩略图方法,它直接等比例将最大的边缩小到符合要求的高度/宽度,当图片宽高比与要求不一致时,将会有边显示空白。

adaptiveResize ($width, $height)

adaptiveResize方法是在一些特定情况下,不要求图片的完整,而要求显示特定宽高的最多内容。具体计算方式是:

当图片宽度大于所要求宽度,而高度一致时,取该高度下,从图片左右的中间去所要求的宽度;
当图片的高度大了并且宽度一致时,去该宽度下,图片上下居中位置取得所要求的高度;
当宽高都不正确时,先将图片缩放到所要求大小,再按前两条执行。
save ($fileName, $format = ‘GIF|JPG|PNG')

当对图片做好处理后,可以用save方法,将图片保存为format中所指示的编码之一,如果未指定编码,将以原编码方式保存。$fileName是要保存的路径。
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