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php offsetGet 像访问数组一样访问对象

https://www.php.net/manual/en/class.arrayaccess.php

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<?php
 
/**
* ArrayAndObjectAccess
* Yes you can access class as array and the same time as object
*
* @author Yousef Ismaeil <cliprz@gmail.com>
*/
 
class ArrayAndObjectAccess implements ArrayAccess {
 
    /**
     * Data
     *
     * @var array
     * @access private
     */
    private $data = [];
 
    /**
     * Get a data by key
     *
     * @param string The key data to retrieve
     * @access public
     */
    public function &__get ($key) {
        return $this->data[$key];
    }
 
    /**
     * Assigns a value to the specified data
     * 
     * @param string The data key to assign the value to
     * @param mixed  The value to set
     * @access public 
     */
    public function __set($key,$value) {
        $this->data[$key] = $value;
    }
 
    /**
     * Whether or not an data exists by key
     *
     * @param string An data key to check for
     * @access public
     * @return boolean
     * @abstracting ArrayAccess
     */
    public function __isset ($key) {
        return isset($this->data[$key]);
    }
 
    /**
     * Unsets an data by key
     *
     * @param string The key to unset
     * @access public
     */
    public function __unset($key) {
        unset($this->data[$key]);
    }
 
    /**
     * Assigns a value to the specified offset
     *
     * @param string The offset to assign the value to
     * @param mixed  The value to set
     * @access public
     * @abstracting ArrayAccess
     */
    public function offsetSet($offset,$value) {
        if (is_null($offset)) {
            $this->data[] = $value;
        } else {
            $this->data[$offset] = $value;
        }
    }
 
    /**
     * Whether or not an offset exists
     *
     * @param string An offset to check for
     * @access public
     * @return boolean
     * @abstracting ArrayAccess
     */
    public function offsetExists($offset) {
        return isset($this->data[$offset]);
    }
 
    /**
     * Unsets an offset
     *
     * @param string The offset to unset
     * @access public
     * @abstracting ArrayAccess
     */
    public function offsetUnset($offset) {
        if ($this->offsetExists($offset)) {
            unset($this->data[$offset]);
        }
    }
 
    /**
     * Returns the value at specified offset
     *
     * @param string The offset to retrieve
     * @access public
     * @return mixed
     * @abstracting ArrayAccess
     */
    public function offsetGet($offset) {
        return $this->offsetExists($offset) ? $this->data[$offset] : null;
    }
 
}
 
 
$foo = new ArrayAndObjectAccess();
// Set data as array and object
$foo->fname = 'Yousef';
$foo->lname = 'Ismaeil';
// Call as object
echo 'fname as object '.$foo->fname."\n";
// Call as array
echo 'lname as array '.$foo['lname']."\n";
// Reset as array
$foo['fname'] = 'Cliprz';
echo $foo['fname']."\n";
 
/** Outputs
fname as object Yousef
lname as array Ismaeil
Cliprz
*/

<?php

/**
* ArrayAndObjectAccess
* Yes you can access class as array and the same time as object
*
* @author Yousef Ismaeil <cliprz@gmail.com>
*/

class ArrayAndObjectAccess implements ArrayAccess {

  /**
   * Data
   *
   * @var array
   * @access private
   */
  private $data = [];

  /**
   * Get a data by key
   *
   * @param string The key data to retrieve
   * @access public
   */
  public function &__get ($key) {
return $this->data[$key];
}

  /**
   * Assigns a value to the specified data
   *
   * @param string The data key to assign the value to
   * @param mixed The value to set
   * @access public
   */
  public function __set($key,$value) {
  $this->data[$key] = $value;
}

  /**
   * Whether or not an data exists by key
   *
   * @param string An data key to check for
   * @access public
   * @return boolean
   * @abstracting ArrayAccess
   */
  public function __isset ($key) {
return isset($this->data[$key]);
}

  /**
   * Unsets an data by key
   *
   * @param string The key to unset
   * @access public
   */
  public function __unset($key) {
unset($this->data[$key]);
}

  /**
   * Assigns a value to the specified offset
   *
   * @param string The offset to assign the value to
   * @param mixed The value to set
   * @access public
   * @abstracting ArrayAccess
   */
  public function offsetSet($offset,$value) {
if (is_null($offset)) {
  $this->data[] = $value;
} else {
  $this->data[$offset] = $value;
}
}

  /**
   * Whether or not an offset exists
   *
   * @param string An offset to check for
   * @access public
   * @return boolean
   * @abstracting ArrayAccess
   */
  public function offsetExists($offset) {
return isset($this->data[$offset]);
}

  /**
   * Unsets an offset
   *
   * @param string The offset to unset
   * @access public
   * @abstracting ArrayAccess
   */
  public function offsetUnset($offset) {
if ($this->offsetExists($offset)) {
unset($this->data[$offset]);
}
}

  /**
   * Returns the value at specified offset
   *
   * @param string The offset to retrieve
   * @access public
   * @return mixed
   * @abstracting ArrayAccess
   */
  public function offsetGet($offset) {
return $this->offsetExists($offset) ? $this->data[$offset] : null;
}

}

?>

Usage

<?php
$foo = new ArrayAndObjectAccess();
// Set data as array and object
$foo->fname = 'Yousef';
$foo->lname = 'Ismaeil';
// Call as object
echo 'fname as object '.$foo->fname."\n";
// Call as array
echo 'lname as array '.$foo['lname']."\n";
// Reset as array
$foo['fname'] = 'Cliprz';
echo $foo['fname']."\n";

/** Outputs
fname as object Yousef
lname as array Ismaeil
Cliprz
*/

?>