mysql - AngularJs + PHP Inserting Data work in first table but not in second -


i having difficulty of why inserting data in second table not "inserting" when in first table "inserted".

controller.js

$scope.addstudent = function(student){      var data {        firstname: student.firstname,        gfirstname: student.firstname     };      $http.put("php/students/addstudent.php",data).then(function(response){         console.log(response);     }); }

addstudent.php

<?php     include("../../connection.php");    $data = json_decode(file_get_contents("php://input"));    $firstname = $data->firstname;    $gfirstname = $data->gfirstname;     $q = "insert tblstudents (firstname) values ('$firstname')";    $db->query($q);    $r = "insert tblparents (firstname) values ('$gfirstname')";    $db->query($r); ?>

i added $r query thinking work way expected work it's not working way expected. no data being inserted table tblparents, while on table tblstudents data inserted normally.

connection.php

<?php     header("cache-control: no-cache, must-revalidate");     $db = new pdo("mysql:host=localhost;dbname=mydb","root",""); ?>

i did try @aynber said in comment in question above. him. , link of related question.

this updated addstudent.php

<?php    include("../../connection.php");        $data = json_decode(file_get_contents("php://input"));     $firstname = $data->firstname;     $gfirstname = $data->gfirstname;      try {     $db->exec("set character set utf8");         $db->setattribute(pdo::attr_errmode, pdo::errmode_exception);      $sql = "     insert `tblstudents`(`firstname`) values (:firstname);     insert `tblguardians`(`firstname`) values (:gfirstname);     ";      $statement = $db->prepare($sql);     $statement->bindvalue(":firstname", $firstname);     $statement->bindvalue(":gfirstname", $gfirstname);      $result = $statement->execute();      }     catch(pdoexception $e) {        echo $e->getmessage();     }      echo json_encode($result);  ?>

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