Yii2 Framework Analysis 2: Object Class

class Object

The object class implements multiple features of the class.

    public function __get($name)    {        $getter = ‘get‘ . $name;        if (method_exists($this, $getter)) {            return $this->$getter();        } elseif (method_exists($this, ‘set‘ . $name)) {            throw new InvalidCallException(‘Getting write-only property: ‘ . get_class($this) . ‘::‘ . $name);        } else {            throw new UnknownPropertyException(‘Getting unknown property: ‘ . get_class($this) . ‘::‘ . $name);        }    }

_ Get

PHP magic method, called when trying to read an attribute that does not exist in an object.

E.g. $ value = $ object-> property, check whether $ object has the getproperty method. If yes, getproperty () is returned. If no, check whether the setproperty () method exists. If yes, a write-only exception is thrown. If not, an unknown attribute exception is thrown.

 

    public function __set($name, $value)    {        $setter = ‘set‘ . $name;        if (method_exists($this, $setter)) {            $this->$setter($value);        } elseif (method_exists($this, ‘get‘ . $name)) {            throw new InvalidCallException(‘Setting read-only property: ‘ . get_class($this) . ‘::‘ . $name);        } else {            throw new UnknownPropertyException(‘Setting unknown property: ‘ . get_class($this) . ‘::‘ . $name);        }    }

_ Set

PHP magic method, called when a graph is written to an object that does not exist.

E.g. when $ object-> property = $ value, check whether $ object has the setproperty method. If yes, call $ object-> setproperty ($ value, the getproperty method is not checked. If yes, a read-only exception is thrown. Otherwise, an unknown property exception is thrown.

 

    public function __isset($name)    {        $getter = ‘get‘ . $name;        if (method_exists($this, $getter)) {            return $this->$getter() !== null;        } else {            return false;        }    }

_ Isset

PHP magic method, called when isset ($ object-> property. Determine whether the $ object-> getproperty method exists.

 

    public function __unset($name)    {        $setter = ‘set‘ . $name;        if (method_exists($this, $setter)) {            $this->$setter(null);        } elseif (method_exists($this, ‘get‘ . $name)) {            throw new InvalidCallException(‘Unsetting read-only property: ‘ . get_class($this) . ‘::‘ . $name);        }    }

_ Unset

PHP magic method, called when unset ($ object-> property. If the $ object-> setproperty method exists, call $ object-> setproperty (null ). If not, an invalidcallexception exception is thrown.

 

    /**     * Calls the named method which is not a class method.     *     * Do not call this method directly as it is a PHP magic method that     * will be implicitly called when an unknown method is being invoked.     * @param string $name the method name     * @param array $params method parameters     * @throws UnknownMethodException when calling unknown method     * @return mixed the method return value     */    public function __call($name, $params)    {        throw new UnknownMethodException(‘Calling unknown method: ‘ . get_class($this) . "::$name()");    }

_ Call

PHP magic method, called when an unknown method is executed, directly throws the unknownmethodexception exception.

 

    /**     * Returns a value indicating whether a method is defined.     *     * The default implementation is a call to php function `method_exists()`.     * You may override this method when you implemented the php magic method `__call()`.     * @param string $name the property name     * @return boolean whether the property is defined     */    public function hasMethod($name)    {        return method_exists($this, $name);    }

Hasmethod

Whether the method exists

 

    /**     * Returns a value indicating whether a property can be read.     * A property is readable if:     *     * - the class has a getter method associated with the specified name     *   (in this case, property name is case-insensitive);     * - the class has a member variable with the specified name (when `$checkVars` is true);     *     * @param string $name the property name     * @param boolean $checkVars whether to treat member variables as properties     * @return boolean whether the property can be read     * @see canSetProperty()     */    public function canGetProperty($name, $checkVars = true)    {        return method_exists($this, ‘get‘ . $name) || $checkVars && property_exists($this, $name);    }    /**     * Returns a value indicating whether a property can be set.     * A property is writable if:     *     * - the class has a setter method associated with the specified name     *   (in this case, property name is case-insensitive);     * - the class has a member variable with the specified name (when `$checkVars` is true);     *     * @param string $name the property name     * @param boolean $checkVars whether to treat member variables as properties     * @return boolean whether the property can be written     * @see canGetProperty()     */    public function canSetProperty($name, $checkVars = true)    {        return method_exists($this, ‘set‘ . $name) || $checkVars && property_exists($this, $name);    }

Cangetproperty cansetproperty

Determine whether the getproperty (setproperty) method exists. The $ checkvars parameter indicates whether to use property_exists to check whether the property exists. The default value is true.

 

    /**     * Returns a value indicating whether a property is defined.     * A property is defined if:     *     * - the class has a getter or setter method associated with the specified name     *   (in this case, property name is case-insensitive);     * - the class has a member variable with the specified name (when `$checkVars` is true);     *     * @param string $name the property name     * @param boolean $checkVars whether to treat member variables as properties     * @return boolean whether the property is defined     * @see canGetProperty()     * @see canSetProperty()     */    public function hasProperty($name, $checkVars = true)    {        return $this->canGetProperty($name, $checkVars) || $this->canSetProperty($name, false);    }

Hasproperty

Check whether the attribute exists, readable, or writable.

 

Yii2 Framework Analysis 2: Object Class