Steps for plugins_url in wordpress plug-in development

The plugins_url method in wordpress plug-in development I used plugins_url () in a php file. the error message is that the undefined method is correct in another php file. both files are in the same directory, & lt ;? Php & nbsp; echo & nbsp; plugins_url ('securimage/securim: plugins_url method in wordpress plug-in development
I used the plugins_url () method in a php file and reported an error saying the undefined method.
But there is no problem in another php file. both files are in the same directory,

'?>这样是没问题的。这个文件是和html混合的

另一个文件是纯php文件，没有html。plugins_url('/securimage/securimage.php',__FILE__);这样一句话就会报错说是未定义的方法

请求帮助 分享到：
------解决方案--------------------
估计没引入什么文件
------解决方案--------------------
贴出错误信息以供分析