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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...序执行过程、跟踪变量值的方法，可以帮我们找到原因。问题出在输入等号之后，此时： 前数=计算结果 后数=0 算符=“”接下来输入算符，由于算符=“”，因此执行点击算符过程的“如果...则”分支，第一行代码为【前数=后数...
普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...让大家多思考（希望我达到这个目的了）。
解决完一个问题后我们要经常“回头看看”，我们要学习的不是“解决具体问题的办法”而不是“解决问题的方法”。很多朋友通过网络或者同事帮助解决完一个问题之后就没有然后...
HTML encoding issues - “” character showing up instead of “ ”
...ead of » , amd When Using this solution the problem solved but there is a php warning: Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at D:\Program Files\wamp\wamp\www\projects\kerala\kerala_public_html\edit\business_details.php:1) in D:\Program ...
How to send a header using a HTTP request through a curl call?
...
In PHP:
curl_setopt($ch, CURLOPT_HTTPHEADER, array('HeaderName:HeaderValue'));
or you can set multiple:
curl_setopt($ch, CURLOPT_HTTPHEADER, array('HeaderName:HeaderValue', 'HeaderName2:HeaderValue2'));
...
phpcms v9与ucenter通信失败 完美解决 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...用 IP：（选填，正常情况下留空即可。如果由于域名解析问题导致 UCenter 与该应用通信失败，请尝试设置为该应用所在服务器的 IP 地址。）
通信密钥：（必填，phpcms 的通信密钥必须与此设置保持一致，否则 phpsso 将无法与 U...
What does $1 [QSA,L] mean in my .htaccess file?
...)$ (matches any URL except the server root), it will be rewritten as index.php?url=$1 which means a request for ollewill be rewritten as index.php?url=olle).
QSA means that if there's a query string passed with the original URL, it will be appended to the rewrite (olle?p=1 will be rewritten as inde...
php array为空的判断 - C/C++ - 清泛网 - 专注C/C++及内核技术
...这两种方法足以应对简单数组和多维数组是否为空的判断问题，个人一般用empty()来做数组非空判断，这样感觉代码看起来更容易理解。
转自： http://www.lutuzhi.com/theweb/433.html
php array 数组 为空判断
Discuz X 首页白板解决之道 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...在合适位置打印特定内容然后exit(0);查看结果，分析出现问题的 1、开启Debug，及url后面跟 &debug=yes，也是网上最多的方法，但可能往往没有效果。
2、排除法，代码一段段的排查，在合适位置打印特定内容然后exit(0);查看结果，...
Using str_replace so that it only acts on the first match?
...ormance', if performance were the primary concern, we would not be writing PHP! Something other than '/' could be used to wrap the pattern, perhaps '~', which would help avoid the escaping problem to some degree. It depends what the data is, and where it came from.
– ThomasReds...
What is the benefit of zerofill in MySQL?
...rkByers, Practically speaking though, wouldn't most client-libraries (e.g. PHP) simply strip the zeros off before they hand it over to the application code? If so, then it really seems somewhat pointless. A bad design in the early days of MySQL.
– Pacerier
May...