This is a thief program, but why can't I assign a value if the string is written like this?

This is a thief program, but why can't I assign a value if the string is written like this ?? This is only part of the program: file a: function & nbsp; cut ($ file, & nbsp; $ from, & nbsp; $ end) & nbsp; {echo & nbsp; $ from; echo & nbsp; $ end; this is a thief program. Why can't I assign a value if the string is written like this ??
This is only part of the program:

File:

Function cut ($ file, $ from, $ end ){
Echo $ from;
Echo $ end;
Die ();
$ Message = explode ($ from, $ file );
$ Message = explode ($ end, $ message [1]);
Return $ message [0];
}

File B:

$ A = cut ($ fileContent ,'','');

The last two parameters of the function in file B are written in this way, and the echo in file a is empty. but changing the parameter value to another string is no problem. why ?? Share:
------ Solution --------------------
It is not really blank, but the html tag is echo, so the browser is blank,
You can right-click the webpage and choose View source file to view the code.
The code should be: