My younger brother, I cannot return the name or age here.

I cannot return the name or age here. & lt ;? PhpclassPerson {? Private $ name ;? Private $ sex ;? Private $ age ;??? // Constructor? Function _ construct ($ na what can I do? I cannot return the name or age here

Class Person {
? Private $ name;
? Private $ sex;
? Private $ age;
? ?
? // Constructor
? Function _ construct ($ name = "", $ sex = "male", $ age = 1 ){
? $ This-> name = $ name;
? $ This-> sex = $ sex;
? $ This-> age = $ age;
? }
? ?
? // Add the _ get () method
? Public function _ get ($ propertName ){
? If ($ propertName = "sex "){
? Return "confidential ";
? }
? Else if ($ propertyName = "age ")
? {
? If ($ this-> age> 30)
? Return $ this-> age-10;
? ?
? Else
? Return $ this-> $ propertyName;
? ?
? }
? Else
? {
? Return $ this-> $ propertyName;
? }
? ?
? }
}

$ Person1 = new Person ("zhang san", "male", 20 );

Echo "name:". $ person1-> name ."
";
Echo "gender:". $ person1-> sex ."
";
Echo "age:". $ person1-> age ."
";


?>

I cannot return the name or age here?
The returned result is as follows:

Name:
Gender: Confidential
Age:
? Thank you for your answers!

------ Solution --------------------
PropertyName! = PropertName

Take a closer look
------ Solution --------------------
PropertyName! = PropertName