sql - If staments with php & Mysql -

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I need a little bit of your help if statement in PHP, as I am new to it

First of all I have this question: 

  $ sqlCmd = "Username by user name. User.user from WHERE user.id = '". $ _GET ['char'] "" 1 border ";   
 And now I have another query  
  visible $ sqlUpdate =" UPDATE user .user SET level = '1' WHERE id = ''. $ _GET ['four']. '' Border1 '';   
 What I have to do, is something like this: Code> If level> 1  run  $ sqlUpdate , then print an error. / P> 
 Thank you! And sorry, if this is a very non-question, then I I'm trying to learn!;)   
 
 
  visible $ sqlUpdate = "UPDATE user.user SET level = '1' WHERE id = ''. Mysql_real_escape_string ($ _GET ['char']). '' And level & gt; 1 LIMIT 1 ";   
 Your code is weak for SQL injection, which you need to avoid all requests properly  
 
  Warning   
 need to avoid  get ,  post  and  request  and a better view will be used.  
  Good read   
     
  1.   
  2.    
     
      Note   
       
    1.  The entire   ext / mysql   PHP extension, which provides the prefix all functions called mysql_ It will be removed in future, and either  PDO  or  MySQLi    
        Good read  < / P> 
         
      1. .  
      2.   
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