wp_robots()

20function wp_robots() {21	/**22	 * Filters the directives to be included in the 'robots' meta tag.23	 *24	 * The meta tag will only be included as necessary.25	 *26	 * @since 5.7.027	 *28	 * @param array $robots Associative array of directives. Every key must be the name of the directive, and the29	 *                      corresponding value must either be a string to provide as value for the directive or a30	 *                      boolean `true` if it is a boolean directive, i.e. without a value.31	 */32	$robots = apply_filters( 'wp_robots', array() );33 34	$robots_strings = array();35	foreach ( $robots as $directive => $value ) {36		if ( is_string( $value ) ) {37			// If a string value, include it as value for the directive.38			$robots_strings[] = "{$directive}:{$value}";39		} elseif ( $value ) {40			// Otherwise, include the directive if it is truthy.41			$robots_strings[] = $directive;42		}43	}44 45	if ( empty( $robots_strings ) ) {46		return;47	}48 49	echo "<meta name='robots' content='" . esc_attr( implode( ', ', $robots_strings ) ) . "' />\n";50}
When	Instructions	Calls it makes
`empty($robots_strings)`	11–12	`apply_filters()`
`!empty($robots_strings)`	18–19	`apply_filters(), esc_attr()`
PHP	Compiled	Executed	Branches	Notes
8.6-dev	33	11–19	5
8.5	33	11–19	5
8.4	33	11–19	5	3 fewer instructions than PHP 8.3
8.3	36	11–22	5
8.2	36	11–22	5
8.1	36	11–22	5
7.4	36	11–22	5