在PHP中定义一个变量

Question

有没有办法在define语句中使用变量;目前$wpdb->prefix正常工作;但$useasprefix=$post->post_author没有;它返回空，除非在这种情况下使用print_r($useasprefix=$post->post_author);它返回1;理想情况下，表格的前缀与post_author

的编号相同

wp_cache_flush(); 
global $wpdb;
global $post;
$useasprefix=$post->post_author;

// Paths
define('Gocal_Plugin_AbsPath', str_replace('\\', '/', ABSPATH).'wp-content/plugins/go-cal/');
define('Gocal', WP_PLUGIN_URL.'/go-cal/');  


// Tables  
define('GOCAL_Set_table',$useasprefix .'_gocal_settings');
define('GOCAL_Cal_table',$useasprefix .'_gocal_calendars');
define('GOCAL_Day_table',$useasprefix .'_gocal_dopbs_days');
define('GOCAL_Res_table',$useasprefix .'_gocal_reservations');
define('GOCAL_Forms_table',$useasprefix .'_gocal_gocal_forms');
define('GOCAL_Forms_Fields_table',$useasprefix .'_gocal_forms_fields');
define('GOCAL_Form_Options_table',$useasprefix.'_gocal_forms_select_options'); 

该帖子应该是全球wordpress $post对象;我现在更新了它;

wp_cache_flush(); 
global $wpdb;
$post = get_queried_object();
$useasprefix=$post->post_author;

// Paths
define('Gocal_Plugin_AbsPath', str_replace('\\', '/', ABSPATH).'wp-content/plugins/go-cal/');
define('Gocal', WP_PLUGIN_URL.'/go-cal/');  


// Tables  
define('GOCAL_Set_table',$useasprefix .'_gocal_settings');
define('GOCAL_Cal_table',$useasprefix .'_gocal_calendars');
define('GOCAL_Day_table',$useasprefix .'_gocal_dopbs_days');
define('GOCAL_Res_table',$useasprefix .'_gocal_reservations');
define('GOCAL_Forms_table',$useasprefix .'_gocal_gocal_forms');
define('GOCAL_Forms_Fields_table',$useasprefix .'_gocal_forms_fields');
define('GOCAL_Form_Options_table',$useasprefix.'_gocal_forms_select_options');