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Detailed explanation on the use of PHPThumb image processing

php中世界最好的语言Original: 2018-05-21 11:45:561304browse

This time I will bring you a detailed explanation of the use of PHPThumb image processing. What are the precautions when using PHPThumb image processing? The following is a practical case, let's take a look.

Download address (github.com/masterexploder/PHPThumb).
Note that this class library has a duplicate name called phpThumb, the only difference is in upper and lower case, so be careful when searching for documents.
There are countless places to process images. It is very cumbersome to use PHP's image function to process images.
And it is very difficult for novices to master. You can use the PHPThumb class library to process images, including image size adjustment, image interception, image watermarking, image rotation and other functions.

Example:

<?php
//加载类库文件
require_once
 &#39;path/to/ThumbLib.inc.php&#39;;
//实例化类库，传入你要处理的图片的地址可以是网络地址，也可以是本地地址
$thumb = PhpThumbFactory::create(&#39;http://www.jbxue.com/&#39;);
//把图片等比缩小到最大宽度 100px或者最高100px，当只输入一个参数的时候，是限制最宽的尺寸。
$thumb->resize(100, 100);
//把图片等比缩小到原来的百分数，比如50就是原来的50%。
$thumb->resizePercent(50);
//截取一个175px * 175px的图片，注意这个是截取，超出的部分直接裁切掉，不是强制改变尺寸。
$thumb->adaptiveResize(175, 175);
//从图片的中心计算，截取200px * 100px的图片。
$thumb->cropFromCenter(200, 100);
//截图，前两个参数分别是需要解出的图片的右上角的坐标X,Y。 后面两个参数是需要解出的图片宽，高。
$thumb->crop(100, 100, 300, 200);
//把图片顺时针反转180度
$thumb->rotateImageNDegrees(180);
//保存（生成）图片,你可以保存其他格式，详细参考文档
$thumb->save( &#39;NewPath/Of/image.jpg &#39; );

This class library has more functions, so I won’t introduce them in detail. If you also need to process images when developing a PHP website, you may wish to read this class. The library's documentation ensures that it's easy for you to process images, and you no longer have to deal with those dozen annoying PHP image processing functions!

Another powerful PHP imageThumbnailClass: phpThumb
In addition to scaling images, this class can also convert images into different formats for output (such as GIF format images Output in PNG format), its special features also include color, special effects, etc.
Official website: http://phpthumb.sourceforge.net/
Generally, you only need the following files:

We&#39;ll be using phpThumb , the open source PHP script to generate thumbnails on the fly.
Download and 
extract
 phpThumb to somewhere in your website folder. Now to use a rounded corner thumbnail of an image, simply use the img tag of HTML with src as
<img src=”phpThumb.php?src=test.jpg&w=200&h=150&fltr[]=ric|20|20&f=png” /> 
Adjust the path to phpThumb according to where you place the phpThumb files.
<html> 
<head>
</head> 
<body> 
    <img src="phpThumb/phpThumb.php?src=../images/test.jpg&w=400&fltr[]=fram|3|2|CC9966|333333|CCCCCC" alt=""> 
</body>  
</html>

In fact, the function of phpThumb is more powerful than I originally imagined, as follows Let’s list some of his other useful parameters:

src: The address of the target image
w: The width of the output image
h: The height of the output image (if not specified, it will Scale according to the w parameter)
q: If the output is in JPG format, you can specify its output quality
bg: The background during output (if necessary)
sw, sh, sx, sy: partial Output, width, height, starting position
f: output format, which can be jpeg, png, gif, ico
sfn: output a certain frame in the gif animation
fltr[]: filter, which can be Many effects, including sharpening, blurring, rotation, watermark, border, masking, color adjustment, etc.

I believe you have mastered the method after reading the case in this article. For more exciting content, please pay attention to other related articles on the PHP Chinese website !

Detailed explanation on the use of PHPThumb image processing

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