Title: WP_Filesystem_Base::is_binary
Published: April 25, 2014
Last modified: April 28, 2025

---

# WP_Filesystem_Base::is_binary( string $text ): bool

## In this article

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

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

Determines if the string provided contains binary characters.

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

 `$text`stringrequired

String to test against.

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

 bool True if string is binary, false otherwise.

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

    ```php
    public function is_binary( $text ) {
    	return (bool) preg_match( '|[^\x20-\x7E]|', $text ); // chr(32)..chr(127)
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-admin/includes/class-wp-filesystem-base.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-admin/includes/class-wp-filesystem-base.php#L458)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/class-wp-filesystem-base.php#L458-L460)

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

| Version | Description | 
| [2.7.0](https://developer.wordpress.org/reference/since/2.7.0/) | Introduced. |

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