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区块链技术到底是什么鬼，为何被疯炒？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...节点都可以扮演“监督者”的身份，因此不用担心欺诈的问题。可扩展：区块链是一种底层开源技术，在此基础上可以实现各类扩展和去中心化、去信任化的应用。匿名化：数据交换的双方可以是匿名的，网络中的节点无需知道...
typecast string to integer - Postgres
...ing into an integer.
Solution
Create a user-defined function inspired by PHP's intval() function.
CREATE FUNCTION intval(character varying) RETURNS integer AS $$
SELECT
CASE
WHEN length(btrim(regexp_replace($1, '[^0-9]', '','g')))>0 THEN btrim(regexp_replace($1, '[^0-9]', '','g'))::intege...
How to find my Subversion server version number?
...>
<body>...
<address>Apache/2.2.11 (Debian) DAV/2 SVN/1.5.6 PHP/5.2.9-4 ...</address>
</body></html>
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Git Diff with Beyond Compare
...
I also found this article: scootersoftware.com/support.php?zz=kb_vcs
– Guy Avraham
Nov 5 '16 at 9:29
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How can I generate an MD5 hash?
...perly, I ended up missing 0s in the hash.
This one seems to be the same as PHP has.
source: http://m2tec.be/blog/2010/02/03/java-md5-hex-0093
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how to show alternate image if source image is not found? (onerror working in IE but not in mozilla)
...
If you're open to a PHP solution:
<td><img src='<?PHP
$path1 = "path/to/your/image.jpg";
$path2 = "alternate/path/to/another/image.jpg";
echo file_exists($path1) ? $path1 : $path2;
?>' alt='' />
</td>
////EDI...
Is a URL allowed to contain a space?
...ey may not properly adhere to the RFC standards. For example, I know that PHP does not.
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实时开发、测试和调试工具 · App Inventor 2 中文网
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Android 日志和 adb（高级）
如果你在 Android 设备上遇到问题，有时可以通过检查 Android 日志来获取信息。 例如，如果你的应用程序空间不足，则会记录在日志中。 日志中的消息通常难以理解，但是你可以使用通知程序组件使你...
ComponentGroup 组件组扩展：监控内容变化和批量启用禁用组件 · App Inventor 2 中文网
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ComponentGroup 扩展解决了 App Inventor 中的两个常见问题：
内容变化检测：无需使用复杂的定时器和值比较即可检测组件内容是否被修改
批量启用/禁用：一次性启用或禁用一组组件（例如在考试期间禁用输入区域）
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Push existing project into Github
...ally. How much you have does not matter. But let's pretend that you have a php project. Let's say that you have the index.php, contact.php and an assets folder with images, css, and fonts. You can do it this way (easy), but there are many options:
Option 1
Login to your github account and create the...