严重性：通知消息：未定义的偏移量：1。在使用codeigniter时发现此错误

Question

I am working with codeigniter. I cannot find any error with the code below, yet this line if($split['1'] == $param)throws an error "Severity: Notice Message: Undefined offset: 1". I checked echoing the value which outputs the exact value. Something seems to go wrong inside the if condition. Any help is greatly appreciated. Thanks

$myfile = fopen("newfile.txt", "r") or die("Unable to open file!"); 
if ($myfile) {
while(!feof($myfile)) {
    $split = explode(',',fgets($myfile),2);
    //echo  $split['1'];
    if($split['1'] == $param){
    echo $split['0'];
      }      
    }
}

Answer 1

Do you have an empty line in file? try it

while(!feof($myfile)) {
    $line = trim(fgets($myfile));
    if(strlen($line) == 0) continue;
    $split = explode(',',$line,2);
    //echo  $split['1'];
    if($split['1'] == $param){
    echo $split['0'];
      }      
    }
}