我正在遵循一个教程，该教程要求我将此代码放在上面wp_head();

<?php
    $example_position = get_theme_mod( \'logo_placement\' );
    if( $example_position != \'\' ) {
        switch ( $example_position ) {
            case \'left\':
                // Do nothing. The theme already aligns the logo to the left
                break;
            case \'right\':
                echo \'<style type="text/css">\';
                echo \'#main-header #logo{ float: right; }\';
                echo \'</style>\';
                break;
            case \'center\':
                echo \'<style type="text/css">\';
                echo \'#main-header{ text-align: center; }\';
                echo \'#main-header #logo { text-align: center; float: none; margin: 0 auto; display:block; }\';
                echo \'</style>\';
                break;
        }
    }
?>

我希望我能从插件中以某种方式连接到它。在检查了抄本后，我希望我可以做这样的事情，但它不起作用。

add_action(\'wp_head\',\'hook_header\');

function hook_header()
{

$output="<?php
    $example_position = get_theme_mod( \'logo_placement\' );
    if( $example_position != \'\' ) {
        switch ( $example_position ) {
            case \'left\':
                // Do nothing. The theme already aligns the logo to the left
                break;
            case \'right\':
                echo \'<style type="text/css">\';
                echo \'#main-header #logo{ float: right; }\';
                echo \'</style>\';
                break;
            case \'center\':
                echo \'<style type="text/css">\';
                echo \'#main-header{ text-align: center; }\';
                echo \'#main-header #logo { text-align: center; float: none; margin: 0 auto; display:block; }\';
                echo \'</style>\';
                break;
        }
    }
?>";

echo $output;

}\'

function hook_header() {
  $example_position = get_theme_mod( \'logo_placement\' );
    if( $example_position != \'\' ) {
        switch ( $example_position ) {
            case \'left\':
                // Do nothing. The theme already aligns the logo to the left
                break;
            case \'right\':
                echo \'<style type="text/css">\';
                echo \'#main-header #logo{ float: right; }\';
                echo \'</style>\';
                break;
            case \'center\':
                echo \'<style type="text/css">\';
                echo \'#main-header{ text-align: center; }\';
                echo \'#main-header #logo { text-align: center; float: none; margin: 0 auto; display:block; }\';
                echo \'</style>\';
                break;
        }
    }
}
add_action(\'wp_head\',\'hook_header\');