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What does the PHP error message “Notice: Use of undefined constant” mean?

PHP is writing this error in the logs: "Notice: Use of undefined constant". 9 Answers ...
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Unzip a file with php

...online somewhere as the correct way to unzip a file is a bit frightening. PHP has built-in extensions for dealing with compressed files. There should be no need to use system calls for this. ZipArchivedocs is one option. $zip = new ZipArchive; $res = $zip->open('file.zip'); if ($res === TRUE) {...
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Getter and Setter?

I'm not a PHP developer, so I'm wondering if in PHP is more popular to use explicit getter/setters, in a pure OOP style, with private fields (the way I like): ...
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How do I expire a PHP session after 30 minutes?

...y registered session. And that is cost-intensive. Furthermore, when using PHP's default session.save_handler files, the session data is stored in files in a path specified in session.save_path. With that session handler, the age of the session data is calculated on the file's last modification date...
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PHP - how to best determine if the current invocation is from CLI or web server?

I need to determine whether the current invocation of PHP is from the command line (CLI) or from the web server (in my case, Apache with mod_php). ...
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Deep Learning(深度学习)学习笔记整理系列之(一) - 大数据 & AI - 清泛...

...是怎么来的?又能干什么呢?目前存在哪些困难呢?这些问题的简答都需要慢慢来。咱们先来了解下机器学习(人工智能的核心)的背景。 二、背景 机器学习(Machine Learning)是一门专门研究计算机怎样模拟或实现人类...
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Deep Learning(深度学习)学习笔记整理系列之(一) - 大数据 & AI - 清泛...

...是怎么来的?又能干什么呢?目前存在哪些困难呢?这些问题的简答都需要慢慢来。咱们先来了解下机器学习(人工智能的核心)的背景。 二、背景 机器学习(Machine Learning)是一门专门研究计算机怎样模拟或实现人类...
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Deep Learning(深度学习)学习笔记整理系列之(一) - 大数据 & AI - 清泛...

...是怎么来的?又能干什么呢?目前存在哪些困难呢?这些问题的简答都需要慢慢来。咱们先来了解下机器学习(人工智能的核心)的背景。 二、背景 机器学习(Machine Learning)是一门专门研究计算机怎样模拟或实现人类...
https://www.tsingfun.com/it/bi... 

Deep Learning(深度学习)学习笔记整理系列之(一) - 大数据 & AI - 清泛...

...是怎么来的?又能干什么呢?目前存在哪些困难呢?这些问题的简答都需要慢慢来。咱们先来了解下机器学习(人工智能的核心)的背景。 二、背景 机器学习(Machine Learning)是一门专门研究计算机怎样模拟或实现人类...
https://www.tsingfun.com/it/bi... 

Deep Learning(深度学习)学习笔记整理系列之(一) - 大数据 & AI - 清泛...

...是怎么来的?又能干什么呢?目前存在哪些困难呢?这些问题的简答都需要慢慢来。咱们先来了解下机器学习(人工智能的核心)的背景。 二、背景 机器学习(Machine Learning)是一门专门研究计算机怎样模拟或实现人类...