下列哪项不是有效的标识符？（）
A: userName
B: 2test
C: $change
D: _password
A: userName
B: 2test
C: $change
D: _password
举一反三
- 下列哪项不是有效的标识符？ A: userName B: _password C: $change D: 2test
- 下列哪项不是有效的标识符。 A: userName B: $change C: 2test D: _passeord
- 以下哪个选项是正确的json数据格式： A: {"id":2,"userName":admin,"passWord":12345,"email":admin@qq.com} B: {id:2,userName:"admin",passWord:"12345",email:"admin@qq.com"} C: {"id":2,"userName":"admin","passWord":"12345","email":"admin@qq.com",} D: {"id":2,"userName":"admin","passWord":"12345","email":"admin@qq.com"}
- 以下哪个选项是正确的json数据格式（） A: { “id”: 2, “userName”: admin, “passWord”: 12345, “email”:[email protected]} B: { id: 2, userName: “admin”, passWord: “12345”, email: “[email protected]”} C: { “id”: 2, “userName”: “admin”, “passWord”: “12345”, “email”: “[email protected]”,} D: { “id”: 2, “userName”: “admin”, “passWord”: “12345”, “email”: “[email protected]”}
- 使用mysql扩展连接 MySql 数据库的正确语法是？ A: mysql_connect($username, $password) B: connect_mysql($username, $password) C: mysql_connect($servername, $username, $password) D: mysql::connect($servername, $username, $password)