WP_Icon_Collections_Registry::register( string $collection_slug, array $collection_properties ): bool

50	public function register( $collection_slug, $collection_properties ) {51		if ( ! isset( $collection_slug ) || ! is_string( $collection_slug ) ) {52			_doing_it_wrong(53				__METHOD__,54				__( 'Icon collection slug must be a string.' ),55				'7.1.0'56			);57			return false;58		}59 60		if ( ! preg_match( '/^[a-z0-9]([a-z0-9_-]*[a-z0-9])?$/', $collection_slug ) ) {61			_doing_it_wrong(62				__METHOD__,63				__( 'Icon collection slug must start and end with a lowercase letter or digit and contain only lowercase letters, digits, hyphens, and underscores.' ),64				'7.1.0'65			);66			return false;67		}68 69		if ( $this->is_registered( $collection_slug ) ) {70			_doing_it_wrong(71				__METHOD__,72				__( 'Icon collection is already registered.' ),73				'7.1.0'74			);75			return false;76		}77 78		if ( ! is_array( $collection_properties ) ) {79			_doing_it_wrong(80				__METHOD__,81				__( 'Icon collection properties must be an array.' ),82				'7.1.0'83			);84			return false;85		}86 87		$allowed_keys = array_fill_keys( array( 'label', 'description' ), 1 );88		foreach ( array_keys( $collection_properties ) as $key ) {89			if ( ! array_key_exists( $key, $allowed_keys ) ) {90				_doing_it_wrong(91					__METHOD__,92					sprintf(93						/* translators: %s: The name of a user-provided key. */94						__( 'Invalid icon collection property: "%s".' ),95						$key96					),97					'7.1.0'98				);99				return false;100			}101		}102 103		if ( ! isset( $collection_properties['label'] ) || ! is_string( $collection_properties['label'] ) ) {104			_doing_it_wrong(105				__METHOD__,106				__( 'Icon collection label must be a string.' ),107				'7.1.0'108			);109			return false;110		}111 112		if ( isset( $collection_properties['description'] ) && ! is_string( $collection_properties['description'] ) ) {113			_doing_it_wrong(114				__METHOD__,115				__( 'Icon collection description must be a string.' ),116				'7.1.0'117			);118			return false;119		}120 121		$defaults = array(122			'description' => '',123		);124 125		$collection = array_merge(126			$defaults,127			$collection_properties,128			array( 'slug' => $collection_slug )129		);