本文实例讲述了php使用timthumb生成缩略图的方法。分享给大家供大家参考,具体如下:
生成缩列图有二种方式:
一、提前生成好,供调用
缩列图常规做法是,开始根据网站中的图片规格,要生成多少种缩列图,图片上传过程中就会生成缩列,供不同需求去调用。像这种方法有一点不好就是,如果增加图片规格以后,以前上传的图片没有该规格的,还要重新生成。
二、调用的时候在生成缩列图。这也是我写这篇文章原因。
推荐一个timthumb,个人觉得在不考虑性能,效率的情况下,这个东西,绝对是好用的。
1,下载地址:http://timthumb.googlecode.com/svn/trunk/timthumb.php
2,使用方法
下载下来后,放到你的web环境中,在与timthumb.php平行的目录中建一个cache文件夹,给于755权限,windows的话,就不用了。测试代码如下:
<?php $image = "http://localhost/test/pen_pic03.png"; ?> <html> <head> <title>timthumb</title> </head> <body> <img src="http://localhost/test/timthumb.php?src=<?php echo $image; ? alt="php使用timthumb生成缩略图的方法_PHP" >&w=58&h=46&zc=1" alt="" /> </body> </html>
参数说明:
w=58 表示图片宽为58
h=46 表示图片高为46
可以根据需要,随便设置。
timthumb最大的优点就是方便,目前还没有遇到过这样的工具,缺点同样明显,每次请求的时候,都会调用php-cgi或者是php-cli,缓存的数据放在cache目录下,调用数据要去查找目录,性能上会比较低。
希望本文所述对大家PHP程序设计有所帮助。

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