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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术
...事的方式，逐步告诉大家比特币提出的动机、解决了什么问题以及一些关键组件的目标和设计方案。
问题的提出
我们先从比特币产生的动机开始。
以物易物的比特村
话说在这个世界上，有一个叫比特村的小村庄，村庄共有...
Does JavaScript have a method like “range()” to generate a range within the supplied bounds?
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@rodfersou FYI: your example is wrong. stop is not actually the stop / end position but count / distance. (no offense, just to make people aware of the typo)
– F Lekschas
Jul 26 '18 at 2:45
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Convert HTML + CSS to PDF [closed]
...ce. Significantly cheaper upfront costs, and usable without needing to install anything: docraptor.com
– Joel Meador
Jan 11 '11 at 8:31
6
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Migration: Cannot add foreign key constraint
...signed();
$table->string('priority_name');
$table->smallInteger('rank');
$table->text('class');
$table->timestamps('timecreated');
});
Schema::table('priorities', function($table) {
$table->foreign('user_id')->references('id')->on('...
Add Text on Image using PIL
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To add text on an image file, just copy/paste the code below
<?php
$source = "images/cer.jpg";
$image = imagecreatefromjpeg($source);
$output = "images/certificate".rand(1,200).".jpg";
$white = imagecolorallocate($image,255,255,255);
$black = imagecolorallocate($image,7,94,94);
$font_siz...
Diagnosing Memory Leaks - Allowed memory size of # bytes exhausted
...h to find it, I'm afraid. The simplest instrument is to selectively place calls to memory_get_usage and narrow it down to where the code leaks. You can also use xdebug to create a trace of the code. Run the code with execution traces and show_mem_delta.
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Symfony 2 EntityManager injection in service
...to inject doctrine EntityManager, but I don't see that __construct() is called on my service, and injection doesn't work.
...
“Keep Me Logged In” - the best approach
...e algorithm that you used. For example:
md5(salt+username+ip+salt)
Now, all an attacker needs to do is brute force the "salt" (which isn't really a salt, but more on that later), and he can now generate all the fake tokens he wants with any username for his IP address! But brute-forcing a salt is...
CURL alternative in Python
I have a cURL call that I use in PHP:
7 Answers
7
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一个转型程序员的销售观 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...，我们擅长技术，却完全不懂营销跟销售。当意识到这个问题的严重性后，我开始承担起业务销售这个角色。
程序员转销售？能做得好吗？做了三年多的app程序开发，自已觉得在技术领域还是做得比较出色的，两年的安卓加一...