Normalize differences between bulk csv response and bulk json response

Author: frankkessler

src/Salesforce.php

@@ -494,7 +494,7 @@ public function call_api($method, $url, $options = [], $debug_info = [])
                 $json = json_encode($xml);
                 $response_array = json_decode($json,TRUE);
             }elseif($format == 'csv'){
-                $response_array = csvToArray((string) $response->getBody());
+                $response_array = csvToArray((string) $response->getBody(), $lowerCaseHeaders=true);
             }else{
                 $response_array = json_decode((string) $response->getBody(), true);
             }

src/helpers.php

@@ -65,11 +65,15 @@ function str_putcsv($input, $delimiter = ',', $enclosure = '"') {
 }
 
 if (!function_exists('csvToArray')) {
-    function csvToArray($csv_string)
+    function csvToArray($csv_string, $lowerCaseHeaders=false)
     {
         $csv = array_map('str_getcsv',explode("\n", $csv_string));
         $header = array_shift($csv);
 
+        if($lowerCaseHeaders){
+            $header = array_map('strtolower', $header);
+        }
+
         $result = [];
 
         foreach($csv as $row){

tests/BulkTest.php

@@ -377,7 +377,7 @@ public function dataResultArray()
 
     public function dataResultCsv()
     {
-        return 'success,created,id,errors
+        return 'Success,Created,Id,Errors
 true,true,001xx000003DHP1AAO,';
     }