Yii2 Framework Essay 6

Now let us uncover the mysterious veil of YII2 's most basic class object.php class (he is the ancestor of all classes)!

Directory location is base/object.php

<?PHP/** * @linkhttp://www.yiiframework.com/* @copyright Copyright (c) Yii software LLC * @licensehttp://www.yiiframework.com/license/ */namespaceYii\Base; use Yii;/** * Object is the base class that implements the *property* feature. * Object is a basic class that implements the function of properties * * A property was defined by A getter method (e.g. ' Getlabel '), and/or a setter method (e.g. ' Set Label ').  For example, * the following getter and setter methods define a property named ' label ': * An attribute that defines the Getter method and/or Setter method * * ~ ~ * Private $_label; * Public Function Getlabel () * {* return $this->_label; *} * Public Function SetLabel ($value) * {* $this ->_label = $value; *} * ~ ~ * Property names is *case-insensitive*. * Attribute name is case sensitive * A property can is accessed like a member variable of an object. Reading or writing a property would cause the invocation * of the corresponding getter or setter method. For example, * properties can be used as member variables of an object * ~ ~ ~ ~//equivalent to $label = $object->getlabel (); * $label = $object->label; *//equivalent to $object->setlabel (' abc '); * $object->label = ' abc '; * ~ ~ * * If a property had only a getter method and have no setter meThod, it is considered as *read-only*. Trying * To modify the property value would cause an exception.  * One can call [[Hasproperty ()]], [[Cangetproperty ()]] and/or [[Cansetproperty ()]] to check the existence of a property. * * Besides the property feature, object also introduces a important object initialization life cycle. In particular, * creating a new instance of Object or its derived class would involve the following life cycles sequential LY: * * 1. The class constructor is invoked; * 2. Object properties is initialized according to the given configuration; * 3. The ' init () ' method is invoked. * In the above, both Step 2 and 3 occur at the end of the class constructor. IT is recommended this * perform object initialization in the ' init () ' method because on that stage, the object config Uration * is already applied.  * In order to ensure the above life cycles, if a child class of Object needs to override the constructor, * it should is Do like the FollowinG: * ~ ~ ~ * Public Function __construct ($param 1, $param 2, ..., $config = []) * {* ... * parent::__construct ($con FIG); *} * ~ ~ ~ * That's, a ' $config ' parameter (defaults to ' [] ') should was declared as the last parameter * of the CONSTRUC Tor, and the parent implementation should is called at the end of the constructor.  * * Yii most basic class, most classes inherit the class * * @author Qiang Xue <[email protected]> * @since 2.0*/classObject implements configurable{/** * Returns the fully qualified name of this class. * Gets the class name of the static method call.     Returns the name of the class, or FALSE if not called in the class.     * * @return String The fully qualified name of this class. */     Public Staticfunction ClassName () {//Get_called_class--the name of the late static binding ("late static binding") class//This is the method called by that class, which returns the class with the namespace in the return value.        returnGet_called_class (); }    /** * Constructor.      * The default implementation does and things: * *-initializes the object with the given configuration ' $config '.     *-Call [[Init ()]]. * Constructors, default implementations do two things
* Initializes the given configuration $config.
* Use the init () method. * If This method was overridden in a child class, it was recommended that * *-the last parameter of the Constructo     R is a configuration array, like ' $config ' here.     *-Call the parent implementation at the end of the constructor. * * @param array $config name-value pairs that'll be used to initialize the object properties*/     Publicfunction __construct ($config = [])    {        //initialize the object based on $config content        if(!empty ($config)) {Yii::configure ($ This, $config); }        //calling the Init () method, classes inheriting from the class can override the Init method for initializing$ This-init (); }    /** * Initializes the object. * Initialize Object * This method was invoked at the end of the constructor after the object was initialized with the * given CO     Nfiguration. */     Publicfunction init () {}/** * Returns The value of a object property. * Don't call the This method directly as it's a PHP magic method that * would be implicitly called when executing '     $value = $object->property; '. * * Magic method, Implement Getter * * @param string $name The property name * @return Mixed the property value * @thr oWS Unknownpropertyexception If the property isn't defined * @throws invalidcallexception if the property is Write-on LY * @see __set ()*/     Publicfunction __get ($name) {$getter='Get'. $name; if(Method_exists ($ This, $getter)) {            //object exists $getter method, it is called directly            return$ This-$getter (); } elseif (Method_exists ($ This,'Set'. $name)) {            //If there is a ' set '. $name method, it is assumed that the property is write-only            Throw NewInvalidcallexception ('Getting write-only Property:'. Get_class ($ This) .'::'. $name); } Else {            //Otherwise, the attribute is not considered to exist            Throw NewUnknownpropertyexception ('Getting Unknown Property:'. Get_class ($ This) .'::'. $name); }    }    /** * Sets value of a object property. * Don't call the This method directly as it's a PHP magic method that * would be implicitly called when executing '     $object->property = $value; '. * * Magic method, implement Setter * * @param string $name The property name or the event name * @param mixed $value the P Roperty value * @throws unknownpropertyexception if the property was not defined * @throws invalidcallexception if The property is Read-only * @see __get ()*/     Publicfunction __set ($name, $value) {$setter='Set'. $name; if(Method_exists ($ This, $setter)) {            //object exists $setter method, it is called directly$ This-$setter ($value); } elseif (Method_exists ($ This,'Get'. $name)) {            //If there is a ' get '. $name method, the property is considered read-only            Throw NewInvalidcallexception ('Setting read-only Property:'. Get_class ($ This) .'::'. $name); } Else {            //Otherwise, the attribute is not considered to exist            Throw NewUnknownpropertyexception ('Setting Unknown Property:'. Get_class ($ This) .'::'. $name); }  }

/** * Checks If the named property was set (NOT null). * Don't call the This method directly as it's a PHP magic method that * would be implicitly called when executing '     Isset ($object->property) '.     * * Note If the property is not defined, false would be returned.     * * Magic method, implement Isset, based on getter implementation, the property of getter method is counted to exist * * @param string $name The properties name or the event name     * @return Boolean whether the named property is set (NOT null). */     Publicfunction __isset ($name) {$getter='Get'. $name; if(Method_exists ($ This, $getter)) {            //There is a $getter method and the obtained value is not null before the attribute is considered to exist            return$ This$getter ()!==NULL; } Else {            return false; }    }

/** * Sets an object property to null. * Don't call the This method directly as it's a PHP magic method that * would be implicitly called when executing '     unset ($object->property) '.     * * Note If the property isn't defined, this method would do nothing.     * If The property is read-only, it'll throw an exception. * * Magic method, implement unset, based on setter implementation, with setter method properties to unset out * * @param string $name The property name * @throw     S Invalidcallexception if the property was read only. */     Publicfunction __unset ($name) {$setter='Set'. $name; if(Method_exists ($ This, $setter)) {            //set it to null by $setter method$ This$setter (NULL); } elseif (Method_exists ($ This,'Get'. $name)) {            //If there is a ' get '. $name method, the property is considered read-only            Throw NewInvalidcallexception ('unsetting read-only Property:'. Get_class ($ This) .'::'. $name); }    }

Yii2 Framework Essay 6