Trim removes the special symbol $.

Trim removes the special symbol $.

$ Source = "$ http://www.baidu.com/call.scv$"; echo trim ($ source, "$ ");

The purpose is to remove the $ sign before and after $ source.
However, the output is:

: // Www.baidu.com/call.scv

Thank you!

Reply to discussion (solution)

$ Source = '$ http://www.baidu.com/call.scv#'; here it should be a single quotation mark
Echo trim ($ source, '$ ');

$ Source = '$ http://www.baidu.com/call.scv+ ';

Change to single quotes. php will parse $ http in double quotes

Error_reporting (E_ALL ^ E_NOTICE); $ source = "$ http://www.baidu.com/call.scv$"; echo $ source;

Because the variable $ http does not exist, http does not exist at the beginning.
In this way

$ Source = '$ http://www.baidu.com/call.scv?'{echo trim ($ source, "$ ");