这可能会完成一项工作，尽管使用模具不是一种很好的方式

add_filter( \'upgrader_package_options\', function( $options ) {

    if (
        isset( $options[\'hook_extra\'][\'action\'] ) &&
        $options[\'hook_extra\'][\'action\'] === \'install\' &&
        isset( $options[\'hook_extra\'][\'type\'] ) &&
        in_array( $options[\'hook_extra\'][\'type\'], [ \'plugin\', \'theme\' ] 
    ) {
        die(\'Plugins & Themes installation disabled!\');
    }

    return $options;
} );