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@ 2022-01-31T09:07:07Z

<?php

class Element {                                                                                           
                                                                                                          
  /**                                                                                                     
   * Checks if the key is a property.                                                                     
   *                                                                                                      
   * @param string $key                         
   *   The key to check.                                                                                  
   *                                                                                                      
   * @return bool                                                                                         
   *   TRUE of the key is a property, FALSE otherwise.
   */                                                                                                     
  public static function property($key) {                                                                 
    return is_string($key) && $key[0] == '#';                                                             
  }                                                                                                       
                                                                                                          
  /**                                                
   * Gets properties of a structured array element (keys beginning with '#').
   *                           
   * @param array $element               
   *   An element array to return properties for.                                                         
   *                                              
   * @return array
   *   An array of property keys for the element.                                                         
   */                                                
  public static function properties(array $element) { 
    return array_filter(array_keys($element), 'static::property');        
  }
}

    $element = [                                
      '#property1' => 'property1',                   
      '#property2' => 'property2',                                                                        
      'property3' => 'property3',                                                                         
      0 => [],                        
    ]; 
    
    $properties = Element::properties($element);
    
    var_dump($properties);

Output for rfc.property-hooks, git.master_jit, git.master: Deprecated: Use of "static" in callables is deprecated in /in/fn61K on line 28 array(2) { [0]=> string(10) "#property1" [1]=> string(10) "#property2" }

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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