If the right-hand side of the assignment is a matrix, then in each iteration the variable is assigned subsequent columns of this matrix.
some_matrix = [1, 2, 3; 4, 5, 6]; % 2 by 3 matrix
for some_column = some_matrix
display(some_column)
end
(The row vector version is a normal case of thi...
<?php
use yii\db\Migration;
class m150101_185401_create_news_table extends Migration
{
public function up()
{
}
public function down()
{
echo "m101129_185401_create_news_table cannot be reverted.\n";
return false;
}
/*
// Use safeUp/safeDown to run migra...
By default, migrations are applied to the same database specified by the db application component. If you want them to be applied to a different database, you may specify the db command-line option like shown below:
yii migrate --db=db2
yii migrate/history # showing the last 10 applied migrations
yii migrate/history 5 # showing the last 5 applied migrations
yii migrate/history all # showing all applied migrations
yii migrate/new # showing the first 10 new migrations
yii migrate/new 5 # showing the first 5 ...
yii migrate
This command will list all migrations that have not been applied so far. If you confirm that you want to apply these migrations, it will run the up() or safeUp() method in every new migration class, one after another, in the order of their timestamp values. If any of the migrations fa...
An abstract class is a class that cannot be instantiated. Abstract classes can define abstract methods, which are methods without any body, only a definition:
abstract class MyAbstractClass {
abstract public function doSomething($a, $b);
}
Abstract classes should be extended by a child cla...
A simple bit-field can be used to describe things that may have a specific number of bits involved.
struct encoderPosition {
unsigned int encoderCounts : 23;
unsigned int encoderTurns : 4;
unsigned int _reserved : 5;
};
In this example we consider an encoder with 23 bits of sin...
SELECT *
FROM
table1,
table2
SELECT
table1.column1,
table1.column2,
table2.column1
FROM
table1,
table2
This is called cross product in SQL it is same as cross product in sets
These statements return the selected columns from multiple tables in one query....
Set memory limit and disable swap limit
docker run -it -m 300M --memory-swap -1 ubuntu:14.04 /bin/bash
Set both memory and swap limit. In this case, container can use 300M memory and 700M swap.
docker run -it -m 300M --memory-swap 1G ubuntu:14.04 /bin/bash
Installation Requirements
The minimum requirement by this project template is that your Web server supports PHP 5.4.0.
Yii2-advanced-app can be installed in two ways. They are
Installing via Composer
Installing from an Archive File
1) Installing via Composer
If you do not already have Comp...
First, download the compiler and components.
Next, add Swift to your path. On macOS, the default location for the downloadable toolchain is /Library/Developer/Toolchains. Run the following command in Terminal:
export PATH=/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin:"${PATH}...
Technically, autoloading works by executing a callback when a PHP class is required but not found. Such callbacks usually attempt to load these classes.
Generally, autoloading can be understood as the attempt to load PHP files (especially PHP class files, where a PHP source file is dedicated for a ...
A closure is an anonymous function that can't access outside scope.
When defining an anonymous function as such, you're creating a "namespace" for that function. It currently only has access to that namespace.
$externalVariable = "Hello";
$secondExternalVariable = "Foo&qu...
