Php reports syntaxerror, unexpectedT_GOTO, and expectingT_STRING errors. the error file and the number of lines point to the above code. why?

Php reports syntaxerror, unexpectedT_GOTO, and expectingT_STRING errors. the error file and number of lines point to the following code. why? The php version of this machine is 5.3.8, Apache/2.2.21. I guess it is an environment problem because it was originally running normally. how can I solve this problem when I put it on another computer? Php reports syntax error, unexpected T_GOTO, expecting T_STRING. the error file and number of lines point to the following code. why?
The php version of this machine is 5.3.8, Apache/2.2.21. I guess it is an environment problem because it was originally running normally, but this problem occurs on another computer.
How can this problem be solved? Sorrow!

Public function goto ($ url, $ msg = NULL ){
If ($ msg ){
$ This-> jsAlert ($ msg );
}
$ This-> js ('document. location = "'. $ url .'";');
$ This-> output (true );
Exit;
}

------ Solution --------------------
From php5.3, php restored the goto commands abandoned by structured programming for years.
Since goto is upgraded to a reserved word, you cannot use it as a function (method) name.

The goto operator can be used to jump to a specified position in the program. You can add a colon to the target location. PHP has certain restrictions on goto. you can only jump to the same file and scope. that is to say, you cannot jump out of one function or class method, or jump to another function. You cannot jump into any loop or switch structure. A common usage is to jump out of a loop or switch, which can replace multiple levels of break.