php - Comparing two inputs with database data: error -

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I am trying to compare two input values ​​with two values ​​from the same line from a MySQL table. But I always get an error message what's wrong with this code? (It worked just fine with one input) 

  // Check connection (mysqli_connect_errno ()) {echo "failed to connect to MySQL:". Mysqli_connect_error (); } // Escape Variable for Security $ numero_cedula = mysqli_real_escape_string ($ conn, $ _POST ['numero_cedula']); $ Codigo = mysqli_real_escape_string ($ cu, $ _POST ['codigo']); $ Sql1 = "Selection number from CDULA test where number codula = $ numero_cedula and chev = $ codigo"; $ ObjGet = mysqli_query ($ conn, $ sql1); If (mysqli_num_rows ($ objGet)) gt; {Echo "duplicate"; } Else {resonant "not a duplicate"; Although the spaces in the column names are allowed in the SQL, for this reason (<< code>   
 
 In your case < / Em>) because there is a place in the column name  Numero Cedula : 
 
  v - space v - space $ sql1 = "Select the sample where Numerar Sedula = $ Numero_cedula and chew = $ codigo "by exam  
 
 When wrapping the column name in the backticks, change to the following: 
 
  $ sql1 = "Select Numeror Sedula" test where 'Numero Sedula' = $ Numero_cedula and chew = $ codigo ";  
 
 Plus, make sure that both the  $ numero_cedula  and  $ codigo  are integers, and that your columns are also  int Type  
 
 If they are not, then both of them will need to be wrapped in quotes. 
 
 Ie: 
 
  $ sql1 = "Examine 'Nemerro Sedula' where 'numero cedula' = '$ numero_cedula' and select chess = 'codigo'; < / Code> 
 
 Add  or die (mysqli_error ($ con))  to  mysqli_query ()  which will show an error in SQL. 
 < Ul> 
  •  You can change the name of the column in your database  Numero_Cedula  underscore. 
    •   
       Sidenote: < / Em>  
     
     You have written:  "It worked just fine with one input" . 
     
     Will need and your table has two different columns like  Numero   and   Cedula  or a  Numero Cedula . < However, using this method is subject to it 
      
       An Insight:   
     
     Also make sure your form elements are named. 
     
     Ie:  name = "numero_cedula"  and  name = "codigo"  
     
     add a reporting error at the top of your file) that will help in finding errors. 
     
      error_reporting (E_ALL); Ini_set ('display_errors', 1);  
     
      SidNote:  Error reporting should only be done in staging, and never for production.

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