Fix bug of dbl qut at html form printing

Author: BaseMax

graphql.php

@@ -5,16 +5,16 @@
 use GraphQL\GraphQL;
 use GraphQL\Utils\BuildSchema;
 
-try {
-  $resolveEcho = require "echo.php";
-  $resolveSum = require "sum.php";
+$resolveEcho = require "echo.php";
+$resolveSum = require "sum.php";
 
+try {
   $schema = file_get_contents("schema.graphql");
   $schema = BuildSchema::build($schema);
   $rootValue = [
     "echo" => $resolveEcho,
     "sum" => $resolveSum,
-    "prefix" => "",
+    "prefix" => "Welcome, Dear ",
   ];
 
   if(isset($_POST["submit"])) {
@@ -28,14 +28,14 @@
     $variableValues = $input["variables"] ?? null;
 
     if($input === null) {
-      print "<form action="" method="POST">";
+      print "<form action=\"\" method=\"POST\">";
       print "<b>Query:</b><br>";
-      print "<textarea name="query"></textarea>";
+      print "<textarea name=\"query\"></textarea>";
       print "<br>";
       print "<b>Variables:</b><br>";
-      print "<textarea name="variables"></textarea>";
+      print "<textarea name=\"variables\"></textarea>";
       print "<br>";
-      print "<button name="submit">Submit</button>";
+      print "<button name=\"submit\">Submit</button>";
       print "</form>";
       exit();
     }