Title: wp_kses_no_null
Published: April 25, 2014
Last modified: May 20, 2026

---

# wp_kses_no_null( string $content, array $options = null ): string

## In this article

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

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

Removes any invalid control characters in a text string.

## 󠀁[Description](https://developer.wordpress.org/reference/functions/wp_kses_no_null/?output_format=md#description)󠁿

Also removes any instance of the `\0` string.

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

 `$content`stringrequired

Content to filter null characters from.

`$options`arrayoptional

Set `'slash_zero'` => `'keep'` when `''` is allowed. Default is `'remove'`.

Default:`null`

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

 string Filtered content.

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

    ```php
    function wp_kses_no_null( $content, $options = null ) {
    	if ( ! isset( $options['slash_zero'] ) ) {
    		$options = array( 'slash_zero' => 'remove' );
    	}

    	$content = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $content );
    	if ( 'remove' === $options['slash_zero'] ) {
    		$content = preg_replace( '/\\\\+0+/', '', $content );
    	}

    	return $content;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/kses.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/kses.php#L1930)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/kses.php#L1930-L1941)

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

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

Filters one HTML attribute and ensures its value is allowed.

  | 
| [wp_sanitize_redirect()](https://developer.wordpress.org/reference/functions/wp_sanitize_redirect/)`wp-includes/pluggable.php` |

Sanitizes a URL for use in a redirect.

  | 
| [safecss_filter_attr()](https://developer.wordpress.org/reference/functions/safecss_filter_attr/)`wp-includes/kses.php` |

Filters an inline style attribute and removes disallowed rules.

  | 
| [wp_kses_bad_protocol()](https://developer.wordpress.org/reference/functions/wp_kses_bad_protocol/)`wp-includes/kses.php` |

Sanitizes a string and removed disallowed URL protocols.

  | 
| [wp_kses()](https://developer.wordpress.org/reference/functions/wp_kses/)`wp-includes/kses.php` |

Filters text content and strips out disallowed HTML.

  | 
| [get_the_content()](https://developer.wordpress.org/reference/functions/get_the_content/)`wp-includes/post-template.php` |

Retrieves the post content.

  |

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

| Version | Description | 
| [1.0.0](https://developer.wordpress.org/reference/since/1.0.0/) | Introduced. |

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