Questions about getting variables for PHP

About PHP getting variable problems

PHP Code

  
   @ $judge =$_get["Speed"];if (@ $keyboard =$_get["Keyboard"]) {$keyboardfinal = 100;} if (@ $judge ==1) {if ($keyboard <40 && $keyboard >0) {@ $keyboardfinal =50;    }} if (@ $judge ==2) {if (@ $keyboard <50&& $keyboard >0) {$keyboardfinal =50;    }} if (@ $judge ==3 && (@ $keyboard <170 && @ $keyboard >0)) {$keyboardfinal =50;    }

If the above code ~ Why in the second, three, four if statements, even if the condition is not able to make $keyboardfinal=50;


------Solution--------------------
@ $judge =$_get["Speed"];
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------Solution--------------------
Do not understand why the landlord to add so many error control, if not reported errors, how do you modify the code?
The code of the landlord changed the following:

PHP Code

$judge = 1; $keyboard =; $keyboardfinal = Null;switch ($judge) {case    1:        if ($keyboard <40 && $keyboard >0)            $keyboardfinal =50;        break;    Case 2:        if ($keyboard <50&& $keyboard >0)            $keyboardfinal =50;        break;    Case 3 && ($keyboard <170 && $keyboard >0):        $keyboardfinal =50;        break;} echo "keyboardfinal-->>". $keyboardfinal; #50
------Solution--------------------

  
   
   
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PHP Code
   
    
@ $judge =$_get["Speed"];
   
    
if (@ $keyboard =$_get["Keyboard"]) {
   
    
$keyboardfinal = 100;
   
    
}
   
    
if (@ $judge ==1) {
   
    
if ($keyboard <40 && $keyboard >0) {
   
    
@ $keyboardfinal = 50;
   
    
    }
   
    
}
   
    
if (@ $judge ==2) {
   
    
if (@ $keyb ...
   
    

  
   
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