関連ワード:  variable name must start with underscore    variable name must start with underscore true or false    variable name in javascript must start with underscore alphabets numbers both a and b    variable names must begin with a or an underscore    a variable name must start with a letter or the underscore character    in php a variable name must start with a letter or the underscore character    a variable name must not start with an alphabet or an underscore    can variable start with underscore  
結果 : variable name must start with underscore