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YII2框架分析2: Object类
class Object
Object类实现了类的多种特性
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); } }
php魔术方法，当试图读取一个对象并不存在的属性的时候被调用。
e.g. $value = http://www.mamicode.com/$object->property的时候，检查$object是否有getproperty方法，如果有，则返回getproperty()，如果没有，检查setproperty()方法是否存在。如果存在，抛出只写异常。如不存在，抛出未知属性异常。
public function __set($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); } }
php魔术方法，当时图写入一个对象不存在的属性的时候被调用。
e.g. $object->property = $value的时候，检查$object是否有setproperty方法，如果有，则调用$object->setproperty($value)方法，没有检查是否有getproperty方法。如果存在，抛出只读异常。否则，抛出未知属性异常。
public function __isset($name) { $getter = ‘get‘ . $name; if (method_exists($this, $getter)) { return $this->$getter() !== null; } else { return false; } }
php魔术方法，isset($object->property)的时候调用。判断是否存在 $object->getproperty方法。
public function __unset($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) . ‘::‘ . $name); } }
php魔术方法，unset($object->property)的时候调用。如果存在$object->setproperty方法，则调用$object->setproperty(null)。如不存在，抛出InvalidCallException异常。
/** * 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()"); }
php魔术方法，执行一个未知方法的时候调用，直接抛出UnknownMethodException异常。
/** * 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, $name); }
方法是否存在
/** * Returns a value indicating whether a property can be read. * A property is readable if: * * - the class has a getter method associated with the specified name * (in this case, property name is case-insensitive); * - the class has a member variable with the specified name (when `$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, $name); }
判断getproperty(setproperty)方法是否存在。$checkVars参数为是否使用property_exists检查属性是否存在，默认为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); }
检查属性是否存在，可读或可写。
YII2框架分析2: Object类
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