Add custom fonts to PDF

Below is a code snippet to add a custom font called jaro. The font files (.ttf) would be stored in the child-theme/assets/fonts directory, but it can be customized based on your use case.

This code would be placed in your child theme functions.php file or similar.

add_filter(
	'wc_cart_pdf_mpdf',
	function ( $mpdf ) {
		$font_name = 'jaro'; // Name of the font.

		$mpdf->AddFontDirectory( get_stylesheet_directory() . '/assets/fonts' ); // Directory where the .ttf files are stored.

		$mpdf->fontdata[ $font_name ] = array(
			'R'  => 'Jaro-Regular.ttf', // Regular.
			'I'  => 'Jaro-Italic.ttf', // Italic.
			'B'  => 'Jaro-Bold.ttf', // Bold.
			'BI' => 'Jaro-BoldItalic.ttf', // Bold Italic.
		);

		foreach ( $mpdf->fontdata as $f => $fs ) {
			if ( isset( $fs['R'] ) && $fs['R'] ) {
				$mpdf->available_unifonts[] = $f;
			}
			if ( isset( $fs['B'] ) && $fs['B'] ) {
				$mpdf->available_unifonts[] = $f . 'B';
			}
			if ( isset( $fs['I'] ) && $fs['I'] ) {
				$mpdf->available_unifonts[] = $f . 'I';
			}
			if ( isset( $fs['BI'] ) && $fs['BI'] ) {
				$mpdf->available_unifonts[] = $f . 'BI';
			}
		}

		$mpdf->SetDefaultFont( $font_name );
		$mpdf->AddFont( $font_name );
		$mpdf->SetFont( $font_name );

		return $mpdf;
	}
);