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Best way to test for a variable's existence in PHP; isset() is clearly broken
...f isset().
Since this is takes the array to check as a function argument, PHP will still raise "notices" if the array itself doesn't exist. In some cases, it can validly be argued that each dimension should have been initialised first, so the notice is doing its job. For other cases, a "recursive" ...
How do I implement a callback in PHP?
How are callbacks written in PHP?
9 Answers
9
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Why would one omit the close tag?
I keep reading it is poor practice to use the PHP close tag ?> at the end of the file. The header problem seems irrelevant in the following context (and this is the only good argument so far):
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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...200万个，但我们设置最大文件描述符限制时，会遇到一些问题，我们在后面详细讲解。
2. 客户端的准备
由于我们需要构建大量的客户端，而我们知道，在一台系统上，连接到一个服务时的本地端口是有限的。由于端口是16位整...
深入浅出计算机字符集编码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...入浅出计算机字符集编码通过解决一个实际工作中的编码问题，深入研究调查了下计算机的字符编码原理，掌握编码的基本原理后，相关的问题都可轻松解决，希望能给大家带来一定帮助。问题缘由：前面页面编码方式统一为UTF...
Checking if form has been submitted - PHP
... type="submit" name="treasure" value="go!">
</form>
Then in the PHP handler:
if (isset($_POST['treasure'])){
echo "treasure will be set if the form has been submitted (to TRUE, I believe)";
}
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App inventor 2的编程 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...这个功能，需要借助拓展，而网上找到的一款拓展运行有问题，不推荐了。其实原理很简单，原生Android代码很容易获取，包装成拓展就可以了，中文网正在开发获取手机相关信息的拓展，完成后会第一时间进行通知，敬请期待...
Are PHP Variables passed by value or by reference?
Are PHP variables passed by value or by reference?
14 Answers
14
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How to force file download with PHP
... to require a file to be downloaded upon the user visiting a web page with PHP. I think it has something to do with file_get_contents , but am not sure how to execute it.
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What is the size limit of a post request?
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It depends on a server configuration. If you're working with PHP under Linux or similar, you can control it using .htaccess configuration file, like so:
#set max post size
php_value post_max_size 20M
And, yes, I can personally attest to the fact that this works :)
If you're using I...