Title: WP_Font_Face::compile_src
Published: November 8, 2023
Last modified: February 24, 2026

---

# WP_Font_Face::compile_src( array $value ): string

## In this article

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

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

This function’s access is marked private. This means it is not intended for use 
by plugin or theme developers, only by core. It is listed here for completeness.

Compiles the `src` into valid CSS.

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

 `$value`arrayrequired

Value to process.

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

 string The CSS.

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

    ```php
    private function compile_src( array $value ) {
    	$src = '';

    	foreach ( $value as $item ) {
    		$src .= ( 'data' === $item['format'] )
    			? ", url({$item['url']})"
    			: ", url('{$item['url']}') format('{$item['format']}')";
    	}

    	$src = ltrim( $src, ', ' );
    	return $src;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/fonts/class-wp-font-face.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/fonts/class-wp-font-face.php#L400)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/fonts/class-wp-font-face.php#L400-L411)

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

| Used by | Description | 
| [WP_Font_Face::build_font_face_css()](https://developer.wordpress.org/reference/classes/wp_font_face/build_font_face_css/)`wp-includes/fonts/class-wp-font-face.php` |

Builds the font-family’s CSS.

  |

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

| Version | Description | 
| [6.4.0](https://developer.wordpress.org/reference/since/6.4.0/) | Introduced. |

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fclasses%2Fwp_font_face%2Fcompile_src%2F)
before being able to contribute a note or feedback.