Remove some uses of function_exists() where no longer necessary

Author: zachborboa

tests/PHPCurlClass/Helper.php

@@ -115,20 +115,12 @@ function get_png()
     return $tmp_filename;
 }
 
-if (function_exists('finfo_open')) {
-    function mime_type($file_path)
-    {
-        $finfo = finfo_open(FILEINFO_MIME_TYPE);
-        $mime_type = finfo_file($finfo, $file_path);
-        finfo_close($finfo);
-        return $mime_type;
-    }
-} else {
-    function mime_type($file_path)
-    {
-        $mime_type = mime_content_type($file_path);
-        return $mime_type;
-    }
+function mime_type($file_path)
+{
+    $finfo = finfo_open(FILEINFO_MIME_TYPE);
+    $mime_type = finfo_file($finfo, $file_path);
+    finfo_close($finfo);
+    return $mime_type;
 }
 
 function upload_file_to_server($upload_file_path) {

tests/PHPCurlClass/server.php

@@ -312,11 +312,8 @@
     echo '}' . "\n";
     exit;
 } elseif ($test === 'error_message') {
-    if (function_exists('http_response_code')) {
-        http_response_code(401);
-    } else {
-        header('HTTP/1.1 401 Unauthorized');
-    }
+    // 401 Unauthorized.
+    http_response_code(401);
     exit;
 } elseif ($test === 'redirect') {
     if (!isset($_GET['redirect'])) {
@@ -342,11 +339,8 @@
         echo 'Redirected: ' . $request_method;
     } else {
         if ($request_method === 'POST') {
-            if (function_exists('http_response_code')) {
-                http_response_code(303);
-            } else {
-                header('HTTP/1.1 303 See Other');
-            }
+            // 303 See Other.
+            http_response_code(303);
 
             header('Location: ?redirect');
         } else {