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What does PHP keyword 'var' do?
...
Answer: From php 5.3 and >, the var keyword is equivalent to public when declaring variables inside a class.
class myClass {
var $x;
}
is the same as (for php 5.3 and >):
class myClass {
public $x;
}
History: It was previously the norm...
AWS: How to disable all services?
...se services one by one. This can be done by visiting:
your AWS account >> My Billing Dashboard
Find your account username and open the drop down menu:
You can check what services are incurring fees.
Percentage table:
I followed the services and turned them off one by one.
In m...
Rails find record with zero has_many records associated [duplicate]
... cities.id = photos.city_id').group('cities.id').having('count(photos.id) > 0')
scope :without_photos, joins('LEFT OUTER JOIN photos ON cities.id = photos.city_id').group('cities.id').having('count(photos.id) = 0')
share...
BLE（四）嗅探工具 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...制指令（不用填initA地址）
数据包类型：M -> S 主机到从机 手机到ble固件
S -> M 从机到主机
广播包：
初始连接包：
连接事件：
请求更新参数包：
接受请求参数...
What is the purpose of the “Prefer 32-bit” setting in Visual Studio and how does it actually work?
...gy you can simply test it by creating a new project and checking Project -> Properties -> Build tab -> Platform target... but note that AnyCPU-32bitPreferred is only available in .Net version 4.5 and higher. That's why the default is AnyCPU.
– Yousha Aleayoub
...
In absence of preprocessor macros, is there a way to define practical scheme specific flags at proje
...line. You add the DEBUG symbol with the -D DEBUG entry.
(Build Settings -> Swift Compiler - Custom Flags)
As usual, you can set a different value when in Debug or when in Release.
I tested it in real code; it doesn't seem to be recognized in a playground.
...
How to check if type of a variable is string?
...one liner: value_is_string = isinstance(value, str if sys.version_info[0] >= 3 else basestring), where >= assumes any eventual Python 4+ keeps the str root class for strings.
– Pi Marillion
Oct 22 '16 at 13:13
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Explicit vs implicit SQL joins
...
On MySQL 5.1.51, both queries have identical execution plans:
mysql> explain select * from table1 a inner join table2 b on a.pid = b.pid;
+----+-------------+-------+------+---------------+------+---------+--------------+------+-------+
| id | select_type | table | type | possible_keys | k...
✔ Checkmark selected row in UITableViewCell
... tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.dataArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ce...
'ssh-keygen' is not recognized as an internal or external command
...elow in windows (With Git for Windows installed)
Run "Git Gui" (Start --> Git --> Git Gui)
Click Help and then Show SSH Key
Click Generate Key if you do not have one already
Note:- this creates the key files under your personal profile folder C:\Users\YourUserID\.ssh\
...