上传头像更换后，由于缓存任然会显示老的头像，请问各位怎么解决？
PHP + HTML
上传了头像后会覆盖原头像，由于缓存原因，只有CTRL+F5刷新才会显示否则一直会显示老的头像
，请问各位怎么解决的？
回复内容：
PHP + HTML
上传了头像后会覆盖原头像，由于缓存原因，只有CTRL+F5刷新才会显示否则一直会显示老的头像
，请问各位怎么解决的？
头像变化之后最好修改头像 url。
如果想要 url 不变，那就需要记得在请求头像的时候带上 ?r=xxx，这个要记得 xxx 每次由服务端或客户端随机生成。
还有一种做法，比如 facebook，对某个用户的头像使用一个固定不变的 url，但实际访问这个 url 的时候则会生成一个 302 跳转到真实的图片地址，真实图片地址保证每个头像都不同。
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