Yii2 Reading Essays 12

<?PHP/** * Checks If a property value is null.     * Check whether the property value is empty. * This method would check in the following order and act accordingly: * This approach will be checked in the following order and acted accordingly: *-a property define D by a Setter:return whether the property value is NULL * properties defined by setter: Returns whether the value of the attribute is empty *-a property of a Behavi Or:return whether the property value is null * The behavior of the attribute: Returns whether the value of the attribute is empty * does not call this method directly as it is a PH     P Magic Method that * would be implicitly called when executing ' isset ($component->property) '. * * Rewrite the Isset method in Object, add the processing to behaviors, loop behaviors, if there are corresponding attributes, it is considered to have * * @param string $name the property Name or the event name * @return Boolean whether the named property is null*/     Public function__isset ($name)    {        $getter= ' Get '.$name; if(method_exists($this,$getter)) {            //returns True if $getter method exists and is not NULL            return $this-$getter() !==NULL; } Else {            //Behavior Property            $this-ensurebehaviors (); //Loop all the behavior            foreach($this->_behaviors as $behavior) {                if($behavior->cangetproperty ($name)) {                    //returns True if there is $name attribute in the behavior and is not NULL                    return $behavior-$name!==NULL; }            }        }        return false; }    /** * Sets a component property to IS null.      * Set component properties to null. * This method would check in the following order and act accordingly: * This approach will be checked in the following order and acted accordingly: *-a property define  D by a Setter:set the attribute value to IS null * property defined by setter: Set the property value to NULL *-a properties of a behavior:set the     property value to being null * attribute's behavior: Set property values to empty * Do not call this method directly as it's a PHP magic method that     * would be implicitly called when executing ' unset ($component->property) '. * * Rewrite the unset method in Object, add the processing to behaviors, loop behaviors, if there are corresponding properties, set to NULL * * @param string $name the property     Name * @throws Invalidcallexception If the property was read only. */     Public function__unset ($name)    {        $setter= ' Set '.$name; if(method_exists($this,$setter)) {            //returns True if $setter method exists and is not NULL            $this-$setter(NULL); return; } Else {            //Behavior Property            $this-ensurebehaviors (); //Loop all the behavior            foreach($this->_behaviors as $behavior) {                if($behavior->cansetproperty ($name)) {                    //set this property to null if there is $name attribute in the behavior                    $behavior-$name=NULL; return; }            }        }        Throw NewInvalidcallexception (' unsetting an unknown or read-only property: '.Get_class($this) . ‘::‘ .$name); }    /** * Calls the named method which is not a class method.      * Named methods that are called Non-class methods.     * This method would check if any attached behavior have * The named method and would execute it if available. * Don't call the This method directly as it's a PHP magic method that * would be implicitly called if an unknown     method is being invoked. * * Rewrite the call method in Object, add the processing to behaviors, loop behaviors, if there is a corresponding method, execute the Behavior method * * @param string $name th E Method Name * @param array $params method parameters * @return Mixed the method return value * @throws Unkno Wnmethodexception when calling unknown method*/     Public function__call ($name,$params)    {        $this-ensurebehaviors (); foreach($this->_behaviors as $object) {            if($object->hasmethod ($name)) {                //there is a method named $name in behavior, execute IT//call_user_func_array-call callback function, and take an array parameter as the parameter of the callback function                return Call_user_func_array([$object,$name],$params); }        }        Throw NewUnknownmethodexception (' Calling unknown method: '.Get_class($this) . "::$name()"); }    /** * This method was called after the object was created by cloning a existing one.     * It removes all behaviors because they is attached to the old object. * * When cloning is performed, its _events and _behaviors are set to NULL * object replication can be done by using the Clone keyword (which, if possible, calls the object's __clone () method).     The __clone () method in the object cannot be called directly.     * ~ ~ ~ $copy _of_object = Clone $object; * ~ ~ ~ * When the object is copied, PHP 5 performs a shallow copy of all properties of the object (shallow copy).     All reference properties will still be a reference to the original variable. */     Public function__clone () {//when an object is copied, its _events is set to an empty array, and the _behaviors is set to null        $this->_events = []; $this->_behaviors =NULL; }

Yii2 Reading Essays 12