global-variables

问题 I have the following in my code /** * The primary database connection object * * @global object $GLOBALS['db'] * @name $db */ global $db; Now you would think that this would be sufficient, but when I run phpdoc, there is no mention of this variable anywhere in the documentation or any other global variable. What gives? This is straight out of the documentation. Why isn't it recognizing and recording this variable as a global? As a secondary question, it seems you ought to be able to reference

问题 Suppose you have to write a template library that operates on a client-supplied type. Also, suppose that this library really needs to access a global variable parameterized by the client-supplied type. How would you go about implementing this pattern? 回答1: @AnonymousCoward this is derived from your solution. note the initialization/destruction patterns in this variant (read the output if you don't have it memorized already). you can use this to defer creation until access, and to destruct and

问题 I have a table that contains system configuration (ie. system_name, system_time_zone..... ) I am trying to identify the best approach to read the configuration automaticly and have the value ready to read in any form in my application. Basically, I want to read the configuration from the table and then set them as a constant variables. When the application loads I can re-use them in any form. How would I be able to do this in C#? 回答1: Well, you could create a singleton class which would read

问题 Maximum and Minimum values from a summed Formula problem Hello, I am currently using Crystal Reports 2008 which is getting its data from an Oracle database. I have looked into this at length and I have been unable to find the information I need. I have query about getting the Maximum and Minimum values from a given formula which totals 2 or more fields. A snapshot of the information I am using is: Field1 = dB1.Left_Serious Field2 = dB1.Left_Dangerous Field3 = @Tester Formula = @LeftTot Fields

问题 Maximum and Minimum values from a summed Formula problem Hello, I am currently using Crystal Reports 2008 which is getting its data from an Oracle database. I have looked into this at length and I have been unable to find the information I need. I have query about getting the Maximum and Minimum values from a given formula which totals 2 or more fields. A snapshot of the information I am using is: Field1 = dB1.Left_Serious Field2 = dB1.Left_Dangerous Field3 = @Tester Formula = @LeftTot Fields

问题 I have a unit (WebFunctions.h) with the declaration String RawURLAllowedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~.-_"; This unit works well in the app. But when I add a component which also declares WebFunctions.h , the initialization of RawURLAllowedChars does not occurs ( RawURLAllowedChars = NULL ). To get the app back to work, plus remove the class declaration of the component is still necessary delete the WebFunctions.obj file. Note: Any declarations in .cpp file,

问题 I have a separate header file for where I declare global variables. I have included that header file in pch.h which is included in every .cpp file. #include "variable.h" I now need to call the variable and read it in an if statment to start some code. Before compilation, no errors are shown in Visual Studio. However, when I compile the code, it returns error: Error LNK2005 "bool ahschecked" (?ahschecked@@3_NA) already defined in checkin.xaml.obj pch.h The variable is "ahschecked" which is

问题 I have a separate header file for where I declare global variables. I have included that header file in pch.h which is included in every .cpp file. #include "variable.h" I now need to call the variable and read it in an if statment to start some code. Before compilation, no errors are shown in Visual Studio. However, when I compile the code, it returns error: Error LNK2005 "bool ahschecked" (?ahschecked@@3_NA) already defined in checkin.xaml.obj pch.h The variable is "ahschecked" which is

问题 I thought this is how you make a variable inside a if/else block global (Case 3). connection.query(sql, function (err,rows){ //Handle Errors if(err){ //Log The Error & Die } //If Successful - Log Results For Now (Change To Export Results) else { //console.log(rows); foo = rows; } }); console.log(foo); // Out: undefined Why can't I access the variable outside of the function? SOLUTION Well, the problem here was one of understanding what asynchronicity really is . After chatting with @AmmarCSE

问题 This question already has answers here : Call to a member function on a non-object [duplicate] (8 answers) Closed 6 years ago . I'm somewhat new to OOP programming so it's very likely I'm making some stupid mistake. Here is my problem. When running my code I get the following error: Fatal error: Call to a member function checkLogin() on a non-object in /application/libraries/Session.php on line 30 Below is the Session.php file (I've commented line 30 to make it easier to find): <?php require