Talk about the differences between PHP operators '::', '->' and '=>'

When I was learning PHP recently, I was a little confused about the three operators "::", "->" and "=>". I will record the learning details here. Let yourself have a stronger grasp.

1."::" Operator

This operator is a method of calling static members in a class, such as:

 class xxx{
  protected static $instance;
 self::$instance="111";
//或者 $this::$instance = "222";
}

2."->"Operator

This operator is a method to operate member variables in a class, which can be non-static members Variables, such as:

 class xxx{
  private $test;
 $this-test="111";
}

3."=>"operator

This budget is used when mapping the key and value of the array operator.

The syntax "index => values", separated by commas, defines the index and value.

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