Title: WP_Speculation_Rules::is_valid_mode
Published: April 28, 2025

---

# WP_Speculation_Rules::is_valid_mode( string $mode ): bool

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#wp--skip-link--target)

Checks whether the given speculation rules mode is valid.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#parameters)󠁿

 `$mode`stringrequired

Speculation rules mode.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#return)󠁿

 bool True if valid, false otherwise.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#source)󠁿

    ```php
    public static function is_valid_mode( string $mode ): bool {
    	return isset( self::$mode_allowlist[ $mode ] );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-speculation-rules.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-speculation-rules.php#L266)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-speculation-rules.php#L266-L268)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#related)󠁿

| Used by | Description | 
| [wp_get_speculation_rules_configuration()](https://developer.wordpress.org/reference/functions/wp_get_speculation_rules_configuration/)`wp-includes/speculative-loading.php` |

Returns the speculation rules configuration.

  | 
| [WP_Speculation_Rules::add_rule()](https://developer.wordpress.org/reference/classes/wp_speculation_rules/add_rule/)`wp-includes/class-wp-speculation-rules.php` |

Adds a speculation rule to the speculation rules to consider.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_speculation_rules/is_valid_mode/?output_format=md#changelog)󠁿

| Version | Description | 
| [6.8.0](https://developer.wordpress.org/reference/since/6.8.0/) | Introduced. |

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