Let's take a look at the problem-php Tutorial.

Let's take a look at what went wrong & lt ;? Phpecho $ titleImg ;? & Gt; why can't I output the following code: & lt ;? Phprequire (web. config. php); return_lang (); $ do $ _ GET [do]; $ gchr (92); $ dostr_replace ($ g, & quot ;, $ _ let's take a look at what went wrong.
Why can't I output this?

The code is as follows:

Require ('web. config. php ');
Return_lang ();
$ Do = $ _ GET ['do '];
$ G = chr (92 );
$ Do = str_replace ($ g, "", $ _ GET ['do ']);
$ Do = str_replace ("/", "", $ do );
$ Do = str_replace ("% 00", "\ 0", $ do );
$ Do = str_replace ("? "," ", $ Do );
$ Do = htmlspecialchars ($ do );
$ Do = strtolower ($ do );
If (! Isset ($ _ GET ['do ']) {jump ('extend. php? Do = webreborn ');} else {
If ($ user_auth-> haslogin (true )){
$ Rs = $ db-> Execute ("Select * from userinfo where userid =? ", Array ($ _ SESSION ['auth _ user']);
$ Auth = $ rs-> GetArray ();
$ Auth = $ auth [0];

Class char_do extends Member {

Var $ inputs = array ('chalist', 'id', 'CID', 'schoollist ');
Var $ stn_rb = false;
Var $ vip_rb = false;

Function char_do (){
Global $ do, $ db, $ auth, $ _ config;
If (! Is_file ("modules/user.". $ do. ". php") {jump ('errorpage. php ');}
Switch ($ do ){


Case 'webpd ':
Include ('Les les/user. webpd. php ');
$ TitleImg = "title_37 ";
Break;


// You can add more page here .....

}
}

Function _ char_select_empty (){
If ($ _ POST [$ this-> inputs [0]! = "-1 "){
Return true;
}
Return false;
}
Function _ school_select_empty (){
If ($ _ POST [$ this-> inputs [3]! = "-1 "){
Return true;
}
Return false;
}
Function _ update_rb_lvl_exp ($ db, $ id ){
Global $ _ config;
$ Rb_res = $ db-> Execute ('update rangame1.dbo. chainfo set '. $ _ config ['ucs_rb_col ']. '= '. $ _ config ['ucs_rb_col ']. '+ ?, ChaLevel = ?, Chaexp =? Where chanum =? ', Array ('1', '1', '0', $ id ));
If ($ rb_res ){
Return true;
}
Return false;
}
Function _ charge_gold ($ db, $ id, $ cost ){
$ Gold_res = $ db-> Execute ('update rangame1.dbo. chainfo set ChaMoney = ChaMoney -? Where chanum =? ', Array ($ cost, $ id ));
If ($ gold_res ){
Return true;
}
Return false;
}
Function resetRbStats ($ db, $ id ){
$ Char_res = $ db-> Execute ('update RanGame1.dbo. ChaInfo set ChaPower = ?, ChaStrong = ?, ChaStrength = ?, ChaSpirit = ?, ChaDex = ?, ChaStRemain =? Where chanum =? ', Array (0, 0, 0, 0, 0, $ id ));
If ($ char_res ){
Return true;
}
Return false;
}
Function _ update_rb_stats ($ db, $ cid, $ stats, $ rev = false ){
If ($ rev = true ){
$ Stn_res = $ db-> Execute ('update rangame1.dbo. chainfo set ChaStRemain = ChaStRemain +? Where chanum =? ', Array ($ stats, $ cid ));
} Else {
$ Stn_res = $ db-> Execute ('update rangame1.dbo. chainfo set ChaStRemain =? Where chanum =? ', Array ($ stats, $ cid ));
}
If ($ stn_res ){
Return true;
}
Return false;
}
Function _ char_list (){
Global $ db, $ auth;
$ Char_list = $ db-> Execute ("SELECT UserNum, ChaNum, ChaName FROM RanGame1.dbo. ChaInfo Where ChaDeleted! = 1 And UserNum =? ", Array ($ auth ['usernum']);
If ($ char_list-> EOF)
Echo' No char';
Foreach ($ char_list as $ char => $ c ){
$ Temp_c =' If (clean_variable ($ _ POST [$ this-> inputs [0]) = $ c ["chanum"]) {
$ Temp_c. = 'Selected = "selected "';
}
$ Temp_c. = 'value = "'. $ c [" chanum "].'"> ';
$ Temp_c. = $ c ["chaname"];
$ Temp_c. ='';

Echo $ temp_c;
}
}
}
$ Char_func = new char_do;
?>

Call Why cannot It be output?

------ Solution --------------------
$ TitleImg, scope
------ Solution --------------------
$ TitleImg is defined in function char_do and is not declared as a global variable.
Only global $ do, $ db, $ auth, $ _ config;

Therefore, it cannot be accessed externally.