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How does Facebook Sharer select Images and other metadata when sharing my URL?
...of 3:1, and in PNG, JPEG or GIF format.
Can I specify multiple images to allow the user to select an image?
Yes, you just need to add multiple image meta tags in the order you want them to appear in. The user will then be presented with an image selector dialog:
I specified the appropriate imag...
Replacing Spaces with Underscores
I have a PHP Script that users will enter a name like: Alex_Newton ,
12 Answers
12
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闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...新连接，其它的Worker会重新进入休眠状态，这就是「惊群问题」。
Nginx缺省激活了accept_mutex，也就是说不会有惊群问题，但真的有那么严重么？实际上Nginx作者Igor Sysoev曾经给过相关的解释：
OS may wake all processes waiting on accept(...
MySQL ('root'@'%') does not exist 的问题 - 爬虫/数据库 - 清泛IT社区，为创新赋能！
MySQL ('root'@'%') does not exist的问题：
在使用mysql时出现问题： The user specified as a definer ('root'@'%') does not exist。
一般是由于root用户对全局host无访问权限。因此只要给root用户添加一个访问权限即可。
解决办法：
登陆mysql ，...
How to round up a number to nearest 10?
...$input / 10) * 10;
Edit: I've been doing it this way for so long.. but TallGreenTree's answer is cleaner.
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迅雷发布无限节点CDN 每GB仅0.1元 - 资讯 - 清泛网 - 专注C/C++及内核技术
...欠发达地区节点资源则明显不足，这种资源分布不均匀的问题，直接影响了CDN的价值。
与众CDN服务商节点增加方式不同的是，迅雷在业内启用个人节点，通过连接至千万个家庭路由的赚钱宝们，织成一张节点均匀密布于全网的...
大数据不是万能的 - 资讯 - 清泛网 - 专注C/C++及内核技术
...地方。我们认为，大数据其实面对的不是99%的机构面对的问题，这个说法跟市场上很多的说法不大一样。
我们看一下，把这个额度分配到一万到十万区域。在这个领域从事信贷服务的，大家马上想到的是信用卡，也可能想到某...
Returning JSON from a PHP Script
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While you're usually fine without it, you can and should set the Content-Type header:
<?php
$data = /** whatever you're serializing **/;
header('Content-Type: application/json');
echo json_encode($data);
If I'm not using a particular fra...
What is the best regular expression to check if a string is a valid URL?
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I wrote my URL (actually IRI, internationalized) pattern to comply with RFC 3987 (http://www.faqs.org/rfcs/rfc3987.html). These are in PCRE syntax.
For absolute IRIs (internationalized):
/^[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]...
How do I make an asynchronous GET request in PHP?
... Am I right in saying that this function is improperly named? It really doesn't have anything to do with the curl library. It's fsock_post_async() more like it
– MikeMurko
Oct 8 '12 at 19:28
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