PhpParseerror: syntaxerror, unexpectedT_STRING. how can this problem be solved?

PhpParseerror: syntaxerror, unexpectedT_STRINGParseerror: syntaxerror, unexpectedT_STRING, expectingT_OLD_FUNCTIONorT_F php Parse error: syntax error, unexpected T_STRING
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in D: \ inetpub \ vhosts \ jszy.hebut.edu.cn \ httpdocs \ admin \ common \ mysql. class. php on line 11



The code for Line 2 is:

Private $ host;



How can this error be reported? is the php version incorrect?


------ Solution --------------------
Private is available only after php5
No. you have php4, right?
For php5, post the first 11 lines of code.
------ Solution --------------------
Specifically, const is available only after 5.3.