YII2 Framework Essay 4

Next we continue to understand component.php

The directory is: vendor/yiisoft/yii2/base/component.php

(Last code is received)

   /** * Sets the value of a component property.
* Set the value of a component property.  * This method would check in the following order and act accordingly: * This approach will examine the following order and take action accordingly: *-a property defined By a Setter:set the property value
Property defined by a setter: Sets the property value. *-an event in the format of ' on XYZ ': Attach the handler to the event "XYZ"
An "on XYZ" format event that the handler attaches to the event "XYZ". *-a behavior in the format of "as XYZ": Attach the behavior named as "XYZ"
The behavior of an "as XYZ" format, which is appended to the behavior named "XYZ". *-a property of a Behavior:set the behavior properties value * A behavior attribute: Sets the property value of the behavior * does not call this method directl Y as it is a PHP magic method that * would be implicitly called when executing ' $component->property = $value; '.
Do not call this method directly, because it is a PHP magic method that is called when executing $component->proerty = $value.
* @param string $name The property name or the event name
Attribute name or event name is character * @param mixed $value the property value
$value for mixed type * @throws Unknownpropertyexception if the property was not defined
If no attribute is defined, an exception message is thrown. * @throws Invalidcallexception If the property is Read-only.
If the property is read-only, an exception message is thrown. * @see __get ()*/     Publicfunction __set ($name, $value) {$setter='Set'. $name; if(Method_exists ($ This, $setter))            {//If $setter This method is called in this class, returns true and does not return false. //Set Property$ This-$setter ($value);            Call the $setter method. return; } elseif (strncmp ($name,' on',3) ===0{//Compare $name and ' on ' first 3 characters, if the first three characters are equal, that is, when $name is ' on ' format,//On Event:attach event handler$ This->on (Trim (substr ($name,3) ), $value);//Executes the on method, which is used to add additional events. return; } elseif (strncmp ($name,' as',3) ===0{//compare $name and ' as ' first 3 characters, if the first three characters are equal, that is, when $name is ' as ' format,//As Behavior:attach behavior$name = Trim (substr ($name,3)); $ This->attachbehavior ($name, $value instanceof Behavior?$value: Yii::createobject ($value)); Additional behavior.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　$name and $value are arguments, followed by ternary operations, if $value This object is an instance of the behavior class, take $value as a parameter, otherwise            Statically invokes the Yii method to create a new object. return; } Else {            //Behavior Property$ This-ensurebehaviors ();//Attach a new event. foreach($ This->_behaviors as$behavior) {                if($behaviorCansetproperty ($name))                    {//If the parameter returns True, $behavior-$name = $value, define the property. $behavior$name =$value; return; }            }        }        if(Method_exists ($ This,'Get'. $name))            {//if ' get '. $name This method belongs to this class, a message "set read-only property" is thrown. Throw NewInvalidcallexception ('Setting read-only Property:'. Get_class ($ This) .'::'. $name); } Else{//If it does not belong to this class, it throws a message "Set unknown property".

Throw NewUnknownpropertyexception ('Setting Unknown Property:'. Get_class ($ This) .'::'. $name); }    }    /** * Checks If a property was set, i.e. defined and NOT NULL. The 
 checks the property settings, which is defined, not NULL. 
 * This method would check in the following order and act accordingly: * This approach will check the following order and take the appropriate action: 
 *-a PR  Operty defined by a Setter:return whether the property is set 
 properties defined by a setter: Returns whether the attribute is set 
 *-a property of a     Behavior:return whether the property is set 
 properties of a behavior: Returns whether the property sets *-return ' false ' for non existing properties     * Returns false for non-existing properties. * Do not call the This method directly as it's a PHP magic method that * would be implicitly called when executing ' isset ( $component->property) '. 
 Do not call this method directly, because it is a PHP magic method that will be called when the Isset ($component->property) is executed.  
 
 * @param string $name The property name or the event name * @return A Boolean whether the named property is     Whether the set 
 property is set to return a Boolean value. * @see http://php.net/manual/en/function.isset.php     */     Publicfunction __isset ($name) {$getter='Get'. $name; if(Method_exists ($ This, $getter))            {//If the $getter method does not exist in this class, return this method so that he is not null. return$ This$getter ()!==NULL; } Else {            //Behavior Property$ This-ensurebehaviors ();            Otherwise, attach a time. foreach($ This->_behaviors as$behavior)                {//Traversal behavior, if this method returns to True, returns this property so that he is not null. if($behaviorCangetproperty ($name)) {                     return$behavior-$name!==NULL; }            }        }        return false; }    /** * Sets a component property to IS null.
Sets the property of a component to null.
* This method would check in the following order and act accordingly: * This approach will examine the following order and take action accordingly: *-a property defined By a Setter:set the property value is null
Property defined by a setter: property value is set to NULL
*-a property of a Behavior:set the attribute value to IS null * one behavior of the properties: property value set to NULL
* Do not call the This method directly as it's a PHP magic method that * would be implicitly called when executing ' unset ( $component->property) '.
Do not call this method directly, as it is a PHP magic method that will be called when executing ' unset ($component->property) '.
* @param string $name The property name * @throws Invalidcallexception If the properties is read only.//If this attribute is read-only then a letter is thrown     Interest. * @seehttp://php.net/manual/en/function.unset.php     */     Publicfunction __unset ($name) {$setter='Set'. $name; if(Method_exists ($ This, $setter))            {//If the $setter method exists in this class, execute the $this-> $setter (null) method. $ This$setter (NULL); return; } Else {            //Behavior Property$ This-ensurebehaviors ();//Additional Eventsforeach($ This->_behaviors as$behavior) {                if($behaviorCansetproperty ($name))                    {//Traversal behavior event, if true, make $behavior-> $name = null. return. $behavior$name =NULL; return; }            }        }        Throw NewInvalidcallexception ('unsetting an unknown or read-only property:'. Get_class ($ This) .'::'. $name);//Otherwise throws the message "reset an unknown or read-only property". }   /** * Calls the named method which is not a class method.     * Call Method Name, not a method of a class. * This method would check if any attached behavior have * The named method and would execute it if available.

This method checks whether there is an additional behavior that has
The naming method (if available) executes it.

     * Don't call this method directly as it's a PHP magic method that * would be     implicitly called when an unknown method is being invoked.
Do not call this method directly, because he is a PHP magic method, when an unknown method executes when this magic method will be called.

* @param string $name The method name * @param array $params method parameters * @return Mixed the method return value * @throws unknownmethodexception when calling unknown method*/     Publicfunction __call ($name, $params)    {        $ This-ensurebehaviors ();//Additional Eventsforeach($ This->_behaviors as$Object) {            if($Object-Hasmethod ($name)) {                returnCall_user_func_array ([$Object, $name], $params);//Use an array as a parameter to invoke a callback function, the return value is the result of the callback function execution, or FALSE. }        }        Throw NewUnknownmethodexception ('calling unknown method:'. Get_class ($ This) .":: $name ()");    Throws a message that calls an unknown method. }    /** * 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. */
This method is called when an existing created object is cloned. 

  public   function __clone () {$this ->_events = [];//event is an empty array. $  this ->_behaviors = null  Span style= "color: #000000;" >;/    /behavior is null.  /*  * * Returns a value indicating whethe R A property was defined for this component.     
 * Returns a value indicating whether the property is defined for this component. * A property is defined if: 
 * A defined attribute if: *  

*-The class has a getter or setter method associated with the specified name
* The class has a getter or setter method that is associated with the specified name * (in the case, the property name is case-insensitive);
* (In this case, the attribute name is not case sensitive); *-The class has a member variable with the specified name (when ' $checkVars ' is true);
* The class has a member variable with the specified name (when ' $ Checkvars ' is true) *-an attached behavior have a property of the the given name (when ' $checkBehaviors '     is true).     * An additional behavior with the given name of the property (when ' $checkBehaviors ' is true).     * @param string $name The property name * @param A Boolean $checkVars whether to treat member variables as properties * @param boolean $checkBehaviors whether to treat behaviors ' properties as properties of this component * @return Bo Olean whether the property is defined * @see cangetproperty () * @see Cansetproperty ()*/     Publicfunction Hasproperty ($name, $checkVars =true, $checkBehaviors =true)    {        return$ This->cangetproperty ($name, $checkVars, $checkBehaviors) | | $ This->cansetproperty ($name,false, $checkBehaviors); 

YII2 Framework Essay 4