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How to allow to accept only image files?
...t is very sketchy on mobiles (as of 2015) and by some reports this may actually prevent some mobile browsers from uploading anything at all, so be sure to test your target platforms well.
For detailed browser support, see http://caniuse.com/#feat=input-file-accept
...
What are the Differences Between “php artisan dump-autoload” and “composer dump-autoload”?
...it different:
1) It will in fact use Composer for some stuff
2) It will call Composer with the optimize flag
3) It will 'recompile' loads of files creating the huge bootstrap/compiled.php
4) And also will find all of your Workbench packages and composer dump-autoload them, one by one.
...
How does PHP 'foreach' actually work?
...r the simplest case is Traversable objects, as for these foreach is essentially only syntax sugar for code along these lines:
foreach ($it as $k => $v) { /* ... */ }
/* translates to: */
if ($it instanceof IteratorAggregate) {
$it = $it->getIterator();
}
for ($it->rewind(); $it->v...
What does PHP keyword 'var' do?
...tants states that var must not be used, and visibility must be declared on all properties.
– Charles Wood
Nov 11 '19 at 14:23
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字符串指针变量与字符数组的区别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...和运算。但是两者是有区别的。在使用时应注意以下几个问题：
1. 字符串指针变量本身是一个变量，用于存放字符串的首地址。而字符串本身是存放在以该首地址为首的一块连续的内存空间中并以‘’作为串的结束。...
[解决]MySql提示:The server quit without updating PID file(…)失败 - 数...
...系统默认，不知道为什么不能自动扩容！以后在处理这个问题！如图所示：
[root@rekfan ~]# df
文件系统 1K-块 已用 可用 已用% 挂载点
/dev/mapper/vg_rekfan-lv_root
51606140 47734848 1249852 100% /
tmpfs ...
如何诊断CDN故障 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，所以诊断起来有点麻烦，必须想想招儿。
首当其冲的问题是如何确认CDN有哪些节点？
幸运的是通过阿里测提供的服务，我们能拿到这个IP列表，当然这个IP列表不可能百分百完整，不过应该包含了大部分的节点，有兴趣的可...
xunsearch主键重复、搜索结果重复 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...te提交会忽略（验证的结果）。
至于想彻底解决重复的问题，还是得从xunsearch后端c/c++源码研究起，也许是未考虑到的bug，官方论坛有人反馈但无结果。
清泛网追记：
xunsearch 1.4.14 版本存在此问题，从 1.4.15 版本起已解决该...
json_encode/json_decode - returns stdClass instead of Array in PHP
...
This really doesn't answer the question, it just provides a workaround. But a lousy workaround, IMO. What if you want json-encoded objects to be decoded as objects and json-decoded associative arrays to be decoded as associative arr...
How to send an email using PHP?
...d also use PHPMailer class at https://github.com/PHPMailer/PHPMailer .
It allows you to use the mail function or use an smtp server transparently. It also handles HTML based emails and attachments so you don't have to write your own implementation.
The class is stable and it is used by many other ...