未初始化的字符串偏移量：0 codeigniter index.php

Question

A PHP Error was encountered
Severity: Notice

Message: Uninitialized string offset: 0

Filename: index.php

Line Number: 154

here is the code

if ( $stCurlHandle !== NULL )
{
    curl_setopt($stCurlHandle, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($stCurlHandle, CURLOPT_TIMEOUT, 12);
    $sResult = @curl_exec($stCurlHandle); 
    if ($sResult[0]=="O") //line number 154
     {$sResult[0]=" ";
     // echo $sResult; // Statistic code end
      }
    curl_close($stCurlHandle); 
}

Answer 1

curl_exec doesn't return an array, just raw data in a string ... if you need the first character of the string you can use

$sResult{0}