不知道错哪了，快崩溃了

不知道哪里错了，快崩溃了
$data1=stripslashes($data1);
$aar=strncasecmp($data1,"select",6);
$arr1=strncasecmp($data1,"insert",6);
if((arr!=0)&&(arr1!=0))
{
  echo "$arr";
  echo "<br>";
  echo "<br>";
  echo "$data1";
  echo "$arr1";
  echo "<br>";

  exit( "false to run sqlcript");
   
   
}

------解决方案--------------------

if(($aar!=0)&&($arr1!=0))
{
echo $aar;

名字你看叉了