Fix variable argument parsing. func_get_arg is 0-indexed (#34)

Author: chingor13

src/Trace/Integrations/Mysql.php

@@ -57,7 +57,7 @@ public static function load()
             if (func_num_args() > 2) {
                 return [
                     'labels' => [
-                        'name' => func_get_arg(3)
+                        'name' => func_get_arg(2)
                     ]
                 ];
             } else {
@@ -99,7 +99,7 @@ public static function load()
             if (func_num_args() > 1) {
                 return [
                     'labels' => [
-                        'name' => func_get_arg(2)
+                        'name' => func_get_arg(1)
                     ]
                 ];
             } else {

src/Trace/Integrations/Postgres.php

@@ -41,8 +41,8 @@ public static function load()
         // resource pg_query([resource $connection], string $query)
         opencensus_trace_function('pg_query', function () {
             $query = func_num_args() > 1
-                ? func_get_arg(2)
-                : func_get_arg(1);
+                ? func_get_arg(1)
+                : func_get_arg(0);
             return [
                 'labels' => ['query' => $query]
             ];
@@ -51,8 +51,8 @@ public static function load()
         // resource pg_query_params([resource $connection], $string $query, array $params)
         opencensus_trace_function('pg_query_params', function () {
             $query = func_num_args() > 2
-                ? func_get_arg(2)
-                : func_get_arg(1);
+                ? func_get_arg(1)
+                : func_get_arg(0);
             return [
                 'labels' => ['query' => $query]
             ];
@@ -61,8 +61,8 @@ public static function load()
         // resource pg_execute([resource $connection], string $stmtname, array $params)
         opencensus_trace_function('pg_execute', function () {
             $statementName = func_num_args() > 2
-                ? func_get_arg(2)
-                : func_get_arg(1);
+                ? func_get_arg(1)
+                : func_get_arg(0);
             return [
                 'labels' => ['statement' => $statementName]
             ];

src/Trace/Integrations/Wordpress.php

@@ -37,7 +37,7 @@ public static function load()
         $nameClosure = function () {
             if (func_num_args() > 0) {
                 return [
-                    'labels' => ['name' => func_get_arg(1)]
+                    'labels' => ['name' => func_get_arg(0)]
                 ];
             }
             return [];