The use of foreach in php

illustrate

1. foreach is a tool that passes objects and can be used alone or in conjunction with iterators and generators.

2. If foreach is defined as a class, all attributes can be output. If it is called as a function outside the category, only public attributes can be output.

Example

 classMyClass
{
public $var1 = 'value 1';
protected $protected = 'protected var';
private $private = 'private var';

function iterateVisible()
{
foreach($this as $key => $value) { //Inside the class, foreach is defined in the member method;
print "$key => $valuen";
}
}
}

$class = new MyClass();
foreach($class as $key => $value) { //Read the object as an external function print "$key => $valuen";
} //var1 => value 1, only output public properties $class->iterateVisible() //var1 => value 1, protected => protected var, private => private var output all object properties;

The above is the use of foreach in php, I hope it will be helpful to everyone.