网站上能动态调用不同尺寸的图片吗-PHP Tutorial-php.cn

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网站上能动态调用不同尺寸的图片吗

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Jun 23, 2016 pm 02:18 PM

回复讨论(解决方案)

我们网站的做法是传一张图就生成七张大小不同的图存储起来. 这七张是根据需求设定好的

然后在对应位置调用对应尺寸的图片

如果用img标签的width height强行缩放网页会卡.

一般都缩小到各种尺寸，别以为这是省略存储空间
比较一下100k到10k缩小前后的流量，设定有10个页面用到这张图，每天1万人访问，都看满了这10页，并假设客户端缓存足够一天的浏览量（当天刷新页面不重新传送图片）

100k*10*10000*30=300G/月
缩小后自然就除以10，30G/月

这只是一张图片只用于10个页面，还没计算页面刷新、更多图片、更多页面调用（别小看“转载”啊）的情况
所以越大的站，越要减少图片字节数，当然是按需要，不能一味只求省流量，也要顾及服务质量

至于图片站展示原图那是另一回事，那是从服务质量角度考虑的，而且原图极少在多个页面重复展示

楼上说的没错存储空间可比流量/带宽便宜太多了....

嗯，纠正一下上面的错误，如果同一张图(url相同)，客户端使用缓存并已存在此图的话，无论多少个页面，都不会重复传，但不同的浏览器，还是少不了的

页面上可能在不同位置,需要不同尺寸的图片

比如发表了一篇文章,上传标题图片,生成了一张原图580*700的和一个宿略图100*100的

如果我要在首页调用这个图片,尺寸是200*240的,怎么办, 是对580*700的原图限定width为200吗?(加载原图影响性能吧)

还是上传图片时,把需要的尺寸图全部上传上去(这样也不太好吧,比如我在首页或其它页面使用的尺寸都不同,岂不是要上传很多的不同尺寸的图片)

有没有什么好的解决方案
数据库结构怎么设计?有七个不同的尺寸标题图,建七个字段存放吗?

不错的思路，学习下

我的做法是用php???生各?尺寸的?片,例如
网站上能动态调用不同尺寸的图片吗
我??a.jpg就是原?,每次用?在?求的?候??不同的尺寸到服?器,服?器???用img.php???整原??客?要求的尺寸,?整完?之後直接?出到客?端,?????出的?片?未被直接存?到服?器上,??做法的好?是不用存?多??片,也不?心流量??,但是他??用服?器的cpu?理能力.

请问和直接读文件比响应速度如何? 比直接?取?存的多?尺寸的?片速度要慢,原因如下:直接?取已存?的?片只需要消耗????,而我的做法?需要cpu首先?整?片的尺寸再?出到客?端,所以多了一?步?.至於慢多少就要看服?器的cpu速度了.

访问量大还是老老实实做静态文件吧
像#1的做法，每当有上传图片就执行转换，保存几种固定尺寸的图片?? 一劳
然后在不同页面调用适合的尺寸，虽然不一定就完全和页面要求一致，但用html轻微改变width/heigh影响不大?? 永逸

更大的站还要cdn缓存呢

动态生成图片对服务器压力太大，还是直接生成多种不同格式的好，毕竟硬盘不值钱。

如果怕图片过多，存储的时候按分辨率存在不同文件夹，以后整理的时候也好删除

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