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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...
In where shall I use isset() and !empty()
...riables and not just values, so isset("foobar") will raise an error. As of PHP 5.5, empty supports both variables and expressions.
So your first question should rather be if isset returns true for a variable that holds an empty string. And the answer is:
$var = "";
var_dump(isset($var));
The typ...
Difference between require, include, require_once and include_once?
In PHP:
25 Answers
25
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PHP/MySQL insert row then get 'id'
...
The PDO equivalent is PDO::lastInsertId (us3.php.net/manual/en/pdo.lastinsertid.php).
– Matthew Flaschen
May 22 '09 at 11:18
11
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PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
... Please, take a look at mb_detect_encoding source code in your php distro (somewhere here: ext/mbstring/libmbfl/mbfl/mbfl_ident.c). This function does not work properly at all. For some encodings it even has "return true", lol. Others are in Ctrl+c Ctrl+v functions. That's because you ca...
Creating anonymous objects in php
... some years, but I think I need to keep the information up to date!
Since PHP 7 it has been possible to create anonymous classes, so you're able to do things like this:
<?php
class Foo {}
$child = new class extends Foo {};
var_dump($child instanceof Foo); // true
?>
You can ...
AsciiConversion 拓展问题：字母开头的会出现“C2”非预期字符 - App Inven...
做TCP通讯时遇到的问题，主要问题是：列表如果是字母开头就会出问题
发送这个列表
字母开头的都有这个问题，文本显示没有问题。
上面那个是程序 ，下面这个是测试工具
测试了一下：
1、ClientSocket拓展默认...
Two-way encryption: I need to store passwords that can be retrieved
...there is much more to note...
How do I encrypt and decrypt a password in PHP?
See below for a strong class that takes care of everything for you:
What is the safest algorithm to encrypt the passwords with?
safest? any of them. The safest method if you're going to encrypt is to protect against ...
Why use sprintf function in PHP?
I am trying to learn more about the PHP function sprintf() but php.net did not help me much as I am still confused, why would you want to use it?
...
How can I sanitize user input with PHP?
...
It's a common misconception that user input can be filtered. PHP even has a (now deprecated) "feature", called magic-quotes, that builds on this idea. It's nonsense. Forget about filtering (or cleaning, or whatever people call it).
What you should do, to avoid problems, is quite simpl...