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浅谈Heatmap:网页热点图生成原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...用AWK来解析日志,当然你也可以使用Perl或别的你熟悉的语言: #!/usr/bin/awk -f BEGIN { FS="&"; } NF == 4 { param["page_x"] = "0"; param["page_y"] = "0"; param["screen_width"] = "0"; param["screen_height"] = "0"; split($0,...
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What does the PHP error message “Notice: Use of undefined constant” mean?

...option constants for round() such as PHP_ROUND_HALF_DOWN only exist in PHP 5.3 or later. So if you tried to use this feature in PHP 5.2, say: $rounded = round($my_var, 0, PHP_ROUND_HALF_DOWN); You'd get this error message: Use of undefined constant PHP_ROUND_HALF_DOWN - assumed 'PHP_ROUND_...
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cleanest way to skip a foreach if array is empty [duplicate]

... Since PHP 5.3, it is possible to leave out the middle part of the ternary operator. So it may become foreach (($result ?: array()) as $item). And if $result may be null, then php 7 introduced null coalescing operator foreach (($result ...
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谈谈创业公司技术的工作模式 - 资讯 - 清泛网 - 专注C/C++及内核技术

...,根据人来选择不同的工作模式,就像豆瓣CEO说的,什么语言工具技术都没关系,最重要的是人、团队。相信经过大家的磨合, 每一个都是超人(技能、沟通、合作)的团队就是这么诞生的。 原创文章,转载请注明: 转载自...
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PHP passing $_GET in linux command prompt

... It's worth noting that, on our Centos 6 machine running PHP 5.3, calling php [script name] "a=1&b=2&c=3" will not populate the $_SERVER['QUERY_STRING'], but you can easily affect the same thing by referencing $_SERVER['argv'][1]. – Eric L. ...
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Get the client IP address using PHP [duplicate]

... In PHP 5.3 or greater, you can get it like this: $ip = getenv('HTTP_CLIENT_IP')?: getenv('HTTP_X_FORWARDED_FOR')?: getenv('HTTP_X_FORWARDED')?: getenv('HTTP_FORWARDED_FOR')?: getenv('HTTP_FORWARDED')?: getenv('REMOTE_ADDR'); ...
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Are negative array indexes allowed in C?

... Found it in K&R Section 5.3, near the end: If one is sure that the elements exist, it is also possible to index backwards in an array; p[-1], p[-2], and so on are syntactically legal, and refer to the elements that immediately precede p[0]. Of cours...
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C# Xml中SelectSingleNode方法中的xpath用法(Xml节点操作最佳方式) - 更...

...# Xml SelectSingleNode xpathXPath 是一门在 XML 文档中查找信息的语言,可用来在 XML 文档中对元素和属性进行遍历。因此使用xpath进行XML节点操作为我们省去了很多逻辑,代码最简单优雅。同时,对 XPath 的理解是很多高级 XML 应用的基...
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C# Xml中SelectSingleNode方法中的xpath用法(Xml节点操作最佳方式) - 更...

...# Xml SelectSingleNode xpathXPath 是一门在 XML 文档中查找信息的语言,可用来在 XML 文档中对元素和属性进行遍历。因此使用xpath进行XML节点操作为我们省去了很多逻辑,代码最简单优雅。同时,对 XPath 的理解是很多高级 XML 应用的基...
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C# Xml中SelectSingleNode方法中的xpath用法(Xml节点操作最佳方式) - 更...

...# Xml SelectSingleNode xpathXPath 是一门在 XML 文档中查找信息的语言,可用来在 XML 文档中对元素和属性进行遍历。因此使用xpath进行XML节点操作为我们省去了很多逻辑,代码最简单优雅。同时,对 XPath 的理解是很多高级 XML 应用的基...