$ This-> $ propertyName = $ value, $ this-> What is the difference between propertyName = $ value?

When setting private member attributes through _ set ($ propertyName, $ value), use $ this-& amp; gt; $ propertyName $ value can be used to modify the private variable value. The $ this-& amp; gt; propertyName $ value write rule cannot be used to modify the variable value. Complete... when setting private member attributes through _ set ($ propertyName, $ value,
You can use $ this-> $ propertyName = $ value to modify the private variable value,
You cannot modify the variable value by using the write rules $ this-> propertyName = $ value.

Complete code:

Class BasePerson {

   private $name;   private $age;   private $average;   function __construct(){       $num_args = func_num_args();       if($num_args == 1){           $this->name = func_get_arg(0);       } elseif($num_args == 2){           $this->name = func_get_arg(0);           $this->age = func_get_arg(1);       } elseif($num_args == 3){           $this->name = func_get_arg(0);           $this->age = func_get_arg(1);           $this->average = func_get_arg(2);       }   }      private function __set($propertyName,$propertyValue){       echo "
BasePerson __set()";       if($propertyName == "name"){           if($propertyValue == "zhangsan" || $propertyValue == "wangwu"){               $this->$propertyName = $propertyValue;           }       } elseif($propertyName=="age"){           if($propertyValue >150 || $propertyValue <0){               return ;           }       }       $this->$propertyName = $propertyValue;   }      function __toString(){       return "
name:".($this->name)."
age:".($this->age)."
average".($this->average);   }

}

Reply content:

When the private member attribute is set through _ set ($ propertyName, $ value,
You can use $ this-> $ propertyName = $ value to modify the private variable value,
You cannot modify the variable value by using the write rules $ this-> propertyName = $ value.

Complete code:

Class BasePerson {

   private $name;   private $age;   private $average;   function __construct(){       $num_args = func_num_args();       if($num_args == 1){           $this->name = func_get_arg(0);       } elseif($num_args == 2){           $this->name = func_get_arg(0);           $this->age = func_get_arg(1);       } elseif($num_args == 3){           $this->name = func_get_arg(0);           $this->age = func_get_arg(1);           $this->average = func_get_arg(2);       }   }      private function __set($propertyName,$propertyValue){       echo "
BasePerson __set()";       if($propertyName == "name"){           if($propertyValue == "zhangsan" || $propertyValue == "wangwu"){               $this->$propertyName = $propertyValue;           }       } elseif($propertyName=="age"){           if($propertyValue >150 || $propertyValue <0){               return ;           }       }       $this->$propertyName = $propertyValue;   }      function __toString(){       return "
name:".($this->name)."
age:".($this->age)."
average".($this->average);   }

}

$ Name = 'test'; $ name = '000000'; var_dump ($ test ); // output 123 // hope you can understand // similarly $ this-> $ proertyName // you need to check the value of $ proertyName, is to set the value of $ proertyName. this attribute $ proertyName = 'age'; $ this-> $ proertyName = '12'; var_dump ($ this-> age ); // output 12 $ this-> proertyName // set the property of proertyName.

Landlord,$this->$propertyName = $valueThis assignment is$thisThe variable in the instance is$propertyNameVariable value.$propertyNameIt is still a variable, and$this->propertyNameIs the $ this attribute;

The former is like this, for example$propertyName = 'enable';
So$this->$propertyNameIt is equivalent$this->enable;