PHP operator comparison: A brief analysis of the difference between '->” and '=>”

First of all, we need to understand the two operators in the PHP language: "->" and "=>". Both operators are used in PHP to access and operate arrays or objects. But this article will focus on the difference between the “->” operator and the “=>” operator.

The "->" operator is used to access object properties, methods and constants. For example:

class MyClass {
  public $myProperty = "Hello World!"; 
  public function myMethod() {
    return "My Method!";
  }
  const MY_CONSTANT = "My Constant!";
}

$myObject = new MyClass();
echo $myObject->myProperty;    // 输出：Hello World!
echo $myObject->myMethod();   // 输出：My Method!
echo MyClass::MY_CONSTANT;     // 输出：My Constant!

In the above code, we instantiate a class named "MyClass" and access the properties, methods and constants in the class definition through the "->" operator.

The "=>" operator is used in PHP to create an array of key-value pairs. For example:

$myArray = array(
  "Name" => "John Doe",
  "Age" => 25,
  "Occupation" => "Web Developer"
);

echo $myArray['Name'];     // 输出：John Doe
echo $myArray['Age'];      // 输出：25
echo $myArray['Occupation'];   // 输出：Web Developer

In the above code, we use the "=>" operator to create an associative array, where the keys are "Name", "Age" and "Occupation", and the corresponding values ​​are "John Doe", "25" and "Web Developer" and then access these values ​​via array subscripts.

In summary, the "->" operator is used to access object properties, methods and constants, while the "=>" operator is used to create an array of key-value pairs. Although these two operators are somewhat similar, they need to be distinguished according to the actual situation when used. Also, remember to use the correct operators to avoid errors.

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