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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);

var_dump: documentation ( source)
array_filter: documentation ( source)
array_keys: documentation ( source)

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