polylang and the-custom-logo

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You may want to get in touch with the Polylang developers about this, but it looks like they have a conditional function you could use: https://polylang.pro/doc/function-reference/

You could use an if statement to check the language like this:

if (pll_current_language('de') ) {
  echo 'German content';
}

Please note that I just typed this out here so it’s not tested – it’s just a reference based on their docs.

thanks for your reply. I made it another way, by subclassing the_get custom_logo method
but I would have preferred if the function was avalaible directly from polylang without having to change the code.
:

function custom_polylang_multilang_logo( $value ) {
	if ( function_exists( 'pll_current_language' ) ) {
		$logos = array(
			'fr' => wp_get_attachment_image('xxx', 'full'),
			'en' => wp_get_attachment_image('xxx', 'full'),
		);
		$default_logo = $logos['fr'];
		$current_lang = pll_current_language();
		if ( isset( $logos[ $current_lang ] ) )
			$value = $logos[ $current_lang ];
		else
			$value = $default_logo;
	}
	$html = sprintf( '%2$s',
            esc_url( home_url( '/' ) ),
            $value
        );
	return $html;
}
add_filter( 'get_custom_logo', 'custom_polylang_multilang_logo' );

That looks like a nice solution. Thanks for posting your code here for anyone else who needs this.