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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 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.6: Deprecated: Use of "static" in callables is deprecated in /in/fn61K on line 28 array(2) { [0]=> string(10) "#property1" [1]=> string(10) "#property2" }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34: array(2) { [0]=> string(10) "#property1" [1]=> string(10) "#property2" }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/fn61K on line 32
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/fn61K on line 27
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/fn61K on line 14
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/fn61K on line 14
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/fn61K on line 14
Process exited with code 255.

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